Properties of the Number 23981

Twenty-Three Thousand Nine Hundred Eighty-One

Basics

Value: 23980 → 23981 → 23982

Parity: odd

Prime: Yes

Previous Prime: 23977

Next Prime: 23993

Digit Sum: 23

Digital Root: 5

Palindrome: No

Factorization: 23981

Divisors: 1, 23981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 101110110101101

Octal: 56655

Duodecimal: 11A65

Hexadecimal: 5dad

Square: 575088361

Square Root: 154.85799947048264

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

Primes of the form j² + (j+1)². A27862

Least prime p such that p minus the multiplication of its digits is the n-th prime before p. A321570

Successive approximations up to 2ⁿ for the 2-adic integer 17^1/4. This is the 1 (mod 4) case. A341751

Primes of the form (4·k + 1)² + (4·k + 2)² where k=0,1,2,3,... A87871

Number of self-inverse permutations p on [n] with displacement of elements restricted by 5: |p(i)-i| <= 5. A239077

Lesser of consecutive primes whose sum is a palindromic number. A242386

Self-convolution square-root of A243950, which is the sums of the squares of the q-binomial coefficients for q=2 in rows of triangle A022166. A243951

Primes of the form 2·n²+86·n+41. A243958

Row sums of irregular triangle A292224. a(n) gives the total number of admissible tuples starting with 0 in the interval [0, 1, ..., n-1]. A292225

Primes p such that q·p+-Mod(p,q) are primes, for q=7. A178387