Properties of the Number 79981

Seventy-Nine Thousand Nine Hundred Eighty-One

Basics

Value: 79980 → 79981 → 79982

Parity: odd

Prime: No

Previous Prime: 79979

Next Prime: 79987

Digit Sum: 34

Digital Root: 7

Palindrome: No

Factorization: 11 ² × 661

Divisors: 1, 11, 121, 661, 7271, 79981

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011100001101101

Octal: 234155

Duodecimal: 3A351

Hexadecimal: 1386d

Square: 6396960361

Square Root: 282.8091229080137

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

Numbers k such that 3·k is a partition number. A213365

Let M = 2 X 2 matrix [ 1 2 / 5 4 ]; a(n) = (1,1) entry of Mⁿ. A92164

Triangle, read by rows, where row n forms a polynomial in y=3·k that generates diagonal n as k=0,1,2,... for n>=0; thus T(n,k) = ∑_j=0..n-k T(n-k,j)*(3·k)^j, with T(n,0)=T(n,n)=1. A113716

Column 2 of triangle A113716, in which row n forms a polynomial in y=3·k that generates diagonal n as k=0,1,2,... for n>=0. A113718

Numbers in which all pairs of consecutive base-6 digits differ by 3. A33077

Composite numbers whose prime factors contain no digits other than 1 and 6. A36306

a(n) = n²*(n³-n+2)/2. A101377

Expansion of (1 - 3·x) / (1 - 5·x + 3·x²). A52961

Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-2,0,1,2}. A79981