Properties of the Number 81131

Eighty-One Thousand One Hundred Thirty-One

Basics

Value: 81130 → 81131 → 81132

Parity: odd

Prime: Yes

Previous Prime: 81119

Next Prime: 81157

Digit Sum: 14

Digital Root: 5

Palindrome: No

Factorization: 81131

Divisors: 1, 81131

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110011101011

Octal: 236353

Duodecimal: 3AB4B

Hexadecimal: 13ceb

Square: 6582239161

Square Root: 284.83503997928347

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 which when added to their reversals are squares. A59799

Primes p such that the sum of p and its reversal is the square of a prime. A367796

Primes whose digits do not appear in two previous terms. A107798

a(n) is the greatest prime q such that A367798(n)² is the sum of q and its reversal. A367900

a(n) = 9·n³/2 - 21·n²/2 + 8·n - 4. A232495

Primes which yield again a prime when the digits are taken according to the lexicographically first superpermutation of corresponding order and of minimal length. A332088

a(n) = n^n-2 * binomial(n,2). A81131

Number of distinct prime factors of (prime p concatenated p times). A101081

Let s(n) = n-th single prime (cf. A007510). Sequence is defined by recurrence a(n+1) = s(a(n)), n = 0,1,2,..., a(0)=1. A64110