Properties of the Number 56921

Fifty-Six Thousand Nine Hundred Twenty-One

Basics

Value: 56920 → 56921 → 56922

Parity: odd

Prime: Yes

Previous Prime: 56911

Next Prime: 56923

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 56921

Divisors: 1, 56921

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 1101111001011001

Octal: 157131

Duodecimal: 28B35

Hexadecimal: de59

Square: 3240000241

Square Root: 238.58122306669483

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

Beginning with 3, least prime such that concatenation of first n terms and its digit reversal both are primes. A113584

T(n,k)=Number of nXk 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors. A202979

Primes of the form k² + k + 55661, with k >= 0. A116206

Primes p such that p+2, n*(p+2)+6 and p*(p+2)+8 are also prime. A130735

Number of n X 3 0..1 arrays with every nonzero element less than or equal to at least two horizontal and vertical neighbors. A202974

Prime p such that p⁵ + p³ + p - 4 and p⁵ + p³ + p + 4 are primes. A243900

a(n) is the least distance of two nodes on the same grid line in an infinite square lattice of one-ohm resistors for which the resistance measured between the two nodes is greater than n ohms. A355955

a(0) = 0, a(1) = 1, a(2·n) = n·a(2·n-1) + a(2·n-2), a(2·n+1) = a(2·n) + a(2·n-1). A56921