Properties of the Number 81345

Eighty-One Thousand Three Hundred Forty-Five

Basics

Value: 81344 → 81345 → 81346

Parity: odd

Prime: No

Previous Prime: 81343

Next Prime: 81349

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 5 × 11 × 17 × 29

Divisors: 1, 3, 5, 11, 15, 17, 29, 33, 51, 55

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011110111000001

Octal: 236701

Duodecimal: 3B0A9

Hexadecimal: 13dc1

Square: 6617009025

Square Root: 285.21044861645584

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

Upper central divisor of n-th primorial. A60796

Number of diagonal dissections of an n-gon into 3 regions. A33275

a(n) = product of first n terms of A001359. A97489

Leading diagonal of triangle in A222310. A222311

Integers k such that k·28·c + 1 is prime for c = 1, 2, 4, 7 and 14. A67199

Structured small rhombicosidodecahedral numbers. A100148

Coefficient of·in the reduction by x² -> x+1 of the polynomial p(n,x) defined at Comments. A192982

a(n) = (n-1)*(n-2)*(n+3)*(n+2)/12. A299120

Octagonal numbers which are the sums of exactly two positive octagonal numbers. A136346

The smallest product of n distinct primes no larger than the (2n)-th to exceed the square root of the (2n)-th primorial. A260079