257 × 521

Prime Factor Structure

Factorization String 257 × 521

Distinct Prime Factors 2

Square Status No

Abundance Measure Deficient

Analytical Properties

Total Divisors 4

Divisor Sum (σ) 134,676

Proper Divisor Sum 779

Digit Sum / Digital Root 31 (Root: 4)

Adjacent Primes #133877 ← → #133919

1 257 521 133,897

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

133,897 401,692 200,846 100,423 301,270 150,635 451,906 225,953 677,860 338,930 169,465 508,396 254,198 127,099 381,298 190,649 571,948 285,974 142,987 428,962 214,481 643,444 321,722 160,861 482,584 241,292 120,646 60,323 180,970 90,485 271,456 135,728 67,864 33,932 16,966 8,483 25,450 12,725 38,176 19,088 9,544 4,772 2,386 1,193 3,580 1,790 895 2,686 1,343 4,030 2,015 6,046 3,023 9,070 4,535 13,606 6,803 20,410 10,205 30,616

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