Properties of the Number 13881

Thirteen Thousand Eight Hundred Eighty-One

Basics

Value: 13880 → 13881 → 13882

Parity: odd

Prime: No

Previous Prime: 13879

Next Prime: 13883

Digit Sum: 21

Digital Root: 3

Palindrome: No

Factorization: 3 × 7 × 661

Divisors: 1, 3, 7, 21, 661, 1983, 4627, 13881

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

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Representations

Binary: 11011000111001

Octal: 33071

Duodecimal: 8049

Hexadecimal: 3639

Square: 192682161

Square Root: 117.81765572273113

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(n) = n*(3·n² - 1)/2. A4188

Interprimes (A024675) which are of the form s·prime, s=21. A75296

List of codewords in binary lexicode with Hamming distance 6 written as decimal numbers. A75934

Number of fixed 6-dimensional polycubes with n cells. A151832

Numbers k such that (k / sum of digits of k) and (k+1 / sum of digits of k+1) are both prime. A85775

The sum of the numbers on straight lines of incrementing length n when drawn over numbers of the square spiral, where each line contains numbers which sum to the minimum possible value, and each number on the spiral can only be in one line. If two or more lines exist with the same sum the one containing the smallest number is chosen. A340974

Numbers m such that 18·m + 1, 36·m + 1, 108·m + 1, and 162·m + 1 are all primes. A372188

Position of 3ⁿ in A051037 (5-smooth numbers). A188426

Number of partitions of 5n into exactly 4 parts. A256327

a(n) is the number of integer triples (x,y,z) satisfying a system of linear inequalities and congruences specified in the comments. A370349