3² × 5 × 13 × 37

Prime Factor Structure

Factorization String 3^2 × 5 × 13 × 37

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 24

Divisor Sum (σ) 41,496

Proper Divisor Sum 19,851

Digit Sum / Digital Root 18 (Root: 9)

Adjacent Primes #21617 ← → #21647

1 3 5 9 13 15 37 39 45 65 111 117 185 195 333 481 555 585 1,443 1,665 2,405 4,329 7,215 21,645

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

21,645 64,936 32,468 16,234 8,117 24,352 12,176 6,088 3,044 1,522 761 2,284 1,142 571 1,714 857 2,572 1,286 643 1,930 965 2,896 1,448 724 362 181 544 272 136 68 34 17 52 26 13 40 20 10 5 16 8 4 2 1

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