λ
Sigma Notebook

1,644,521

761 × 2161
Deficient Odd Composite

1,644,521 is odd and not a perfect square. Its factorization is 761 × 2161 and its 4 divisors sum to 1,647,444.

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Prime Factor Structure

Factorization String 761 × 2161
Distinct Prime Factors 2
Square Status No
Abundance Measure Deficient

Analytical Properties

Total Divisors 4
Divisor Sum (σ) 1,647,444
Proper Divisor Sum 2,923
Digit Sum / Digital Root 23 (Root: 5)
Adjacent Primes #1644497 ← → #1644547

Radix Representation

Decimal 1644521
Binary 110010001011111101001 (21 bits)
Octal 0o6213751
Hexadecimal 0x1917E9

Divisor Catalog (4)

Collatz Trajectory (150 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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