Properties of the Number 481

Four Hundred Eighty-One

Basics

Value: 480 → 481 → 482

Parity: odd

Prime: No

Previous Prime: 479

Next Prime: 487

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 13 × 37

Divisors: 1, 13, 37, 481

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

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Representations

Binary: 111100001

Octal: 741

Duodecimal: 341

Hexadecimal: 1e1

Square: 231361

Square Root: 21.93171219946131

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

Centered square numbers: a(n) = 2·n*(n+1)+1. Sums of two consecutive squares. Also, consider all Pythagorean triples (X, Y, Z=Y+1) ordered by increasing Z; then sequence gives Z values. A1844

Octagonal numbers: n*(3·n-2). Also called star numbers. A567

a(n) = number of partitions of n into parts of 2 kinds. A712

Generalized octagonal numbers: k*(3·k-2), k=0, +- 1, +- 2, +-3, ... A1082

a(n) = ceiling(n²/2). A982

Brilliant numbers: semiprimes (products of two primes, A001358) whose prime factors have the same number of decimal digits. A78972

Y-toothpick sequence (see Comments lines for definition). A160120

Flavius Josephus's sieve: Start with the natural numbers; at the k-th sieving step, remove every (k+1)-st term of the sequence remaining after the (k-1)-st sieving step; iterate. A960

a(n) = 10·n + 1. A17281

a(n) = floor(n²/3). A212