Properties of the Number 80997

Eighty Thousand Nine Hundred Ninety-Seven

Basics

Value: 80996 → 80997 → 80998

Parity: odd

Prime: No

Previous Prime: 80989

Next Prime: 81001

Digit Sum: 33

Digital Root: 6

Palindrome: No

Factorization: 3 × 7 ² × 19 × 29

Divisors: 1, 3, 7, 19, 21, 29, 49, 57, 87, 133

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 10011110001100101

Octal: 236145

Duodecimal: 3AA59

Hexadecimal: 13c65

Square: 6560514009

Square Root: 284.5997189035857

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(1)=1; thereafter a(n) = smallest number m such that a(n-1)+m = (a(n-1) followed by the leading digit of m). A224752

The positive integers arranged in nonincreasing order of centrality (the fraction of n represented by the average gcd of n and the other positive integers). A80997

a(n) = ∑_{k=0..floor(n/4)} 2^k * 3^n-3·k * binomial(n-3·k+6,6) * binomial(2*(n-3·k),2·k). A391724