Properties of the Number 56781

Fifty-Six Thousand Seven Hundred Eighty-One

Basics

Value: 56780 → 56781 → 56782

Parity: odd

Prime: No

Previous Prime: 56779

Next Prime: 56783

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ⁴ × 701

Divisors: 1, 3, 9, 27, 81, 701, 2103, 6309, 18927, 56781

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 1101110111001101

Octal: 156715

Duodecimal: 28A39

Hexadecimal: ddcd

Square: 3224081961

Square Root: 238.28764130772709

Classification

Fibonacci: No

Bell Number: No

Factorial Number: No

Regular Number: No

Perfect Number: No

Special

Kaprekar Constant: No

Munchausen Constant: No

Armstrong Number: No

Kaprekar Number: No

Catalan Number: No

Vampire Number: No

Taxicab Number: No

Super Prime: No

Friedman Number: No

Fermat Number: No

Cullen Number: No

OEIS Sequences

a(n) is the smallest number not yet in the sequence such that concatenation of all terms yields an infinite periodic stream of digits 1, 2, 3, ..., 8 (repeat from 1). A165306

Expansion of e.g.f. (1/x) * Series_Reversion( x·exp(-x·exp(3·x)) ). A380973

Records in the sequence A024573 defined by [1/{n·e}], {x} := x - [x]. A101262

Numbers k such that 3·R_k - 10 is prime, where R_k = 11...1 is the repunit (A002275) of length k. A256773

Prime powers such that the 4th power of the number of divisors is not smaller than the number itself. A56781

a(n) = n·nⁿ - (n-1)*(n-1)ⁿ. A85283