12813331 has 4 divisors (see below), whose sum is σ = 13255200. Its totient is φ = 12371464.

The previous prime is 12813329. The next prime is 12813337. The reversal of 12813331 is 13331821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12813331 - 2¹ = 12813329 is a prime.

It is a super-2 number, since 2×12813331² = 328362902631122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12813337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220891 + ... + 220948.

It is an arithmetic number, because the mean of its divisors is an integer number (3313800).

Almost surely, 2^12813331 is an apocalyptic number.

12813331 is a deficient number, since it is larger than the sum of its proper divisors (441869).

12813331 is an equidigital number, since it uses as much as digits as its factorization.

12813331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441868.

The product of its digits is 432, while the sum is 22.

The square root of 12813331 is about 3579.5713430521. The cubic root of 12813331 is about 234.0025993818.

It can be divided in two parts, 128133 and 31, that added together give a square (128164 = 358²).

The spelling of 12813331 in words is "twelve million, eight hundred thirteen thousand, three hundred thirty-one".