λ
Sequence Observatory

6,987,821

6987821
Deficient Odd Prime

Starting at 6,987,821, the Collatz iteration reaches 1 after 191 steps. The first transition is 20963464; the starting value is odd with 2 positive divisors.

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Prime Factor Structure

Factorization String 6987821
Distinct Prime Factors 1
Square Status No
Abundance Measure Deficient

Analytical Properties

Total Divisors 2
Divisor Sum (σ) 6,987,822
Proper Divisor Sum 1
Digit Sum / Digital Root 41 (Root: 5)
Adjacent Primes #6987817 ← → #6987823

Radix Representation

Decimal 6987821
Binary 11010101010000000101101 (23 bits)
Octal 0o32520055
Hexadecimal 0x6AA02D

Divisor Catalog (2)

Collatz Trajectory (191 steps to reach 1)

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

Showing the first 5 trajectory entries; the stopping-time total above is unchanged.

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