Properties of the Number 79821

Seventy-Nine Thousand Eight Hundred Twenty-One

Basics

Value: 79820 → 79821 → 79822

Parity: odd

Prime: No

Previous Prime: 79817

Next Prime: 79823

Digit Sum: 27

Digital Root: 9

Palindrome: No

Factorization: 3 ² × 7 ² × 181

Divisors: 1, 3, 7, 9, 21, 49, 63, 147, 181, 441

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 10011011111001101

Octal: 233715

Duodecimal: 3A239

Hexadecimal: 137cd

Square: 6371392041

Square Root: 282.5261049885479

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

Number T(n,k) of equivalence classes of ways of placing k 4 X 4 tiles in an n X n square under all symmetry operations of the square; irregular triangle T(n,k), n>=4, 0<=k<=floor(n/4)², read by rows. A236757

Triangle t(n,k) read by rows: fibonomial ratios c(n)/(c(k)*c(n-k)) where c are partial products of a generalized Fibonacci sequence with multiplier m=4. A172349

Expansion of 1/((1-x)*(1-2·x)*(1-5·x)*(1-7·x)). A21124

When this sequence is interleaved with its first differences and the resulting sequence is divided into blocks of 10 digits, each block contains 10 distinct digits. Each term is chosen to be the smallest that satisfies this property. A101246

A290131/2. A331754

Smallest n-digit multiple of the n-th prime. A79821