Properties of the Number 81517

Eighty-One Thousand Five Hundred Seventeen

Basics

Value: 81516 → 81517 → 81518

Parity: odd

Prime: Yes

Previous Prime: 81509

Next Prime: 81527

Digit Sum: 22

Digital Root: 4

Palindrome: No

Factorization: 81517

Divisors: 1, 81517

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011111001101101

Octal: 237155

Duodecimal: 3B211

Hexadecimal: 13e6d

Square: 6645021289

Square Root: 285.5118211212979

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

From table of maximal epacts e(p) and corresponding primes p, for x₁=2, x_m+1 = (x_m)²+1; sequence gives p. A14424

One-quarter of the number of regions in the central square of an equal-armed cross with arms of length n (as in A331456). A337641

Primes of the form prime(i)*prime(i+1)+prime(i+2)*prime(i+3)+...+prime(k-1)*prime(k). A340465

Concatenation of primitive Pythagorean triangles, sorted. A138043

Primes formed from the concatenation of primitive Pythagorean triples. A138044

Primes p of the form p=n²+3n+9 such that q=p²+3p+9 is also prime. A175284

Consider the smallest number m which can be expressed as the sum of n distinct numbers coprime to m. Sequence gives triangle (read by rows) of the set of coprime numbers pertaining to m. When there is a choice, use the lexicographically earliest solution. A81517