Properties of the Number 19491

Nineteen Thousand Four Hundred Ninety-One

Basics

Value: 19490 → 19491 → 19492

Parity: odd

Prime: No

Previous Prime: 19489

Next Prime: 19501

Digit Sum: 24

Digital Root: 6

Palindrome: Yes

Factorization: 3 × 73 × 89

Divisors: 1, 3, 73, 89, 219, 267, 6497, 19491

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 100110000100011

Octal: 46043

Duodecimal: B343

Hexadecimal: 4c23

Square: 379899081

Square Root: 139.61017154921055

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 k and k+1 have the same sum of unitary divisors (A034448). A64125

Numbers k such that bsigma(k) = bsigma(k+1), where bsigma(k) is the sum of the bi-unitary divisors of k (A188999). A293183

Numbers k such that isigma(k) = isigma(k+1), where isigma(k) is the sum of the infinitary divisors of k (A049417). A306985

Palindromic in bases 10 and 36. A250412

Numbers that are the sum of seven fourth powers in six or more ways. A345572

Numbers that are the sum of seven fourth powers in seven or more ways. A345573

Numbers that are the sum of seven fourth powers in eight or more ways. A345574

Numbers that are the sum of seven fourth powers in nine or more ways. A345575

Numbers that are the sum of seven fourth powers in exactly nine ways. A345831

Decimal expansion of (19491+12070·sqrt(2))/97². A157471