1,515,649

19 × 241 × 331

Starting at 1,515,649, the Collatz iteration reaches 1 after 80 steps. The first transition is 4546948; the starting value is odd with 8 positive divisors.

Prime Factor Structure

Factorization String 19 × 241 × 331

Distinct Prime Factors 3

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 8

Divisor Sum (σ) 1,606,880

Proper Divisor Sum 91,231

Digit Sum / Digital Root 31 (Root: 4)

Adjacent Primes #1515643 ← → #1515671

Radix Representation

Decimal	1515649
Binary	101110010000010000001 (21 bits)
Octal	0o5620201
Hexadecimal	0x172081

Divisor Catalog (8)

1 19 241 331 4,579 6,289 79,771 1,515,649

Collatz Trajectory (80 steps to reach 1)

Iterative sequence n → n/2 (if even) or 3n+1 (if odd):

1,515,649 4,546,948 2,273,474 1,136,737 3,410,212 1,705,106 852,553 2,557,660 1,278,830 639,415 1,918,246 959,123 2,877,370 1,438,685 4,316,056 2,158,028 1,079,014 539,507 1,618,522 809,261 2,427,784 1,213,892 606,946 303,473 910,420 455,210 227,605 682,816 341,408 170,704 85,352 42,676 21,338 10,669 32,008 16,004 8,002 4,001 12,004 6,002 3,001 9,004 4,502 2,251 6,754 3,377 10,132 5,066 2,533 7,600 3,800 1,900 950 475 1,426 713 2,140 1,070 535 1,606

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