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Sigma Notebook

218,657

218657
Deficient Odd Prime

218,657 is odd and not a perfect square. Its factorization is 218657 and its 2 divisors sum to 218,658.

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Prime Factor Structure

Factorization String 218657
Distinct Prime Factors 1
Square Status No
Abundance Measure Deficient

Analytical Properties

Total Divisors 2
Divisor Sum (σ) 218,658
Proper Divisor Sum 1
Digit Sum / Digital Root 29 (Root: 2)
Adjacent Primes #218651 ← → #218677

Radix Representation

Decimal 218657
Binary 110101011000100001 (18 bits)
Octal 0o653041
Hexadecimal 0x35621

Divisor Catalog (2)

Collatz Trajectory (186 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.

218,657 655,972 327,986 163,993 491,980

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