3 × 7 × 31 × 991

Prime Factor Structure

Factorization String 3 × 7 × 31 × 991

Distinct Prime Factors 4

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 16

Divisor Sum (σ) 1,015,808

Proper Divisor Sum 370,667

Digit Sum / Digital Root 21 (Root: 3)

Adjacent Primes #645137 ← → #645149

1 3 7 21 31 93 217 651 991 2,973 6,937 20,811 30,721 92,163 215,047 645,141

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

645,141 1,935,424 967,712 483,856 241,928 120,964 60,482 30,241 90,724 45,362 22,681 68,044 34,022 17,011 51,034 25,517 76,552 38,276 19,138 9,569 28,708 14,354 7,177 21,532 10,766 5,383 16,150 8,075 24,226 12,113 36,340 18,170 9,085 27,256 13,628 6,814 3,407 10,222 5,111 15,334 7,667 23,002 11,501 34,504 17,252 8,626 4,313 12,940 6,470 3,235 9,706 4,853 14,560 7,280 3,640 1,820 910 455 1,366 683

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