Properties of the Number 1813

One Thousand Eight Hundred Thirteen

Basics

Value: 1812 → 1813 → 1814

Parity: odd

Prime: No

Previous Prime: 1811

Next Prime: 1823

Digit Sum: 13

Digital Root: 4

Palindrome: No

Factorization: 7 ² × 37

Divisors: 1, 7, 37, 49, 259, 1813

Polygonal

Triangular: No

Square: No

Pentagonal: No

Hexagonal: No

Heptagonal: No

Tetrahedral: No

Today's Target

2730 Try Today's Challenge

Representations

Binary: 11100010101

Octal: 3425

Duodecimal: 1071

Hexadecimal: 715

Square: 3286969

Square Root: 42.579337712087536

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

Odd numbers of the form p^1+4k * r², where p is prime of the form 1+4m, r > 1, and gcd(p,r) = 1. (Euler's criteria for odd perfect numbers). A228058

Number of "ON" cells at n-th stage in the "Ulam-Warburton" two-dimensional cellular automaton. A147562

Cardinality of set of sets of parts of all partitions of n. A88314

Number of polyominoes with n cells, symmetric about two orthogonal axes. A56877

Integers of the form t/6, where t is a triangular number (A000217). A154293

Sum of first n semiprimes. A62198

a(n) = n*(n + 12). A98847

Odd numbers producing exactly 3 odd numbers in the Collatz (3x+1) iteration. A198584

Minimal number of people to give a 50% probability of having at least n coincident birthdays in one year. A14088

Numbers that are not the sum + product of any set of positive integers > 1. Zeros of A379679. A379680