Properties of the Number 81965

Eighty-One Thousand Nine Hundred Sixty-Five

Basics

Value: 81964 → 81965 → 81966

Parity: odd

Prime: No

Previous Prime: 81953

Next Prime: 81967

Digit Sum: 29

Digital Root: 2

Palindrome: No

Factorization: 5 × 13 ² × 97

Divisors: 1, 5, 13, 65, 97, 169, 485, 845, 1261, 6305

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 10100000000101101

Octal: 240055

Duodecimal: 3B525

Hexadecimal: 1402d

Square: 6718261225

Square Root: 286.29530209208815

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

a(n) = A337339(n) - n. A337341

Number of nonempty subsets of {1, 2, ..., n} with <=8 pairwise coprime elements. A187269

Number of base 15 circular n-digit numbers with adjacent digits differing by 5 or less. A125378

Diagonal of A081964. A81965

G.f. A(x) satisfies: the sum of the coefficients of x^k, k=0..n, in A(x)ⁿ equals 2^n² for n>=0. A232689