Properties of the Number 19691

Nineteen Thousand Six Hundred Ninety-One

Basics

Value: 19690 → 19691 → 19692

Parity: odd

Prime: No

Previous Prime: 19687

Next Prime: 19697

Digit Sum: 26

Digital Root: 8

Palindrome: Yes

Factorization: 7 × 29 × 97

Divisors: 1, 7, 29, 97, 203, 679, 2813, 19691

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2196 Try Today's Challenge

Representations

Binary: 100110011101011

Octal: 46353

Duodecimal: B48B

Hexadecimal: 4ceb

Square: 387735481

Square Root: 140.3246236410417

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 of parts in all partitions of n into distinct parts. A15723

Numbers that are the sum of 9 positive 9th powers. A3398

Numbers that are the sum of 11 positive 8th powers. A3389

a(n) = 3·9ⁿ + 8. A224790

a(n) = smallest number that leads to a new cycle under the base-3 Kaprekar map of A164993. A165009

E.g.f. satisfies A(x) * log(A(x)) = x·exp(-x). A357247

Number of ordered rooted trees with n nodes, most of which are leaves. A358585

Positive integers of the form (6·m² + 1)/11. A179337

Numbers which are the sum of two positive cubes and divisible by 29. A224483

Number of partitions p of n such that (number of numbers of the form 5k in p) is a part of p. A241549