821 × 991

Prime Factor Structure

Factorization String 821 × 991

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 815,424

Proper Divisor Sum 1,813

Digit Sum / Digital Root 20 (Root: 2)

Adjacent Primes #813601 ← → #813613

1 821 991 813,611

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

813,611 2,440,834 1,220,417 3,661,252 1,830,626 915,313 2,745,940 1,372,970 686,485 2,059,456 1,029,728 514,864 257,432 128,716 64,358 32,179 96,538 48,269 144,808 72,404 36,202 18,101 54,304 27,152 13,576 6,788 3,394 1,697 5,092 2,546 1,273 3,820 1,910 955 2,866 1,433 4,300 2,150 1,075 3,226 1,613 4,840 2,420 1,210 605 1,816 908 454 227 682 341 1,024 512 256 128 64 32 16 8 4

Other feeder batches with open delivery windows. Each feeder keeps its own target batch.