13557131 has 4 divisors (see below), whose sum is σ = 15493872. Its totient is φ = 11620392.

The previous prime is 13557119. The next prime is 13557149. The reversal of 13557131 is 13175531.

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

It is a de Polignac number, because none of the positive numbers 2^k-13557131 is a prime.

It is a super-2 number, since 2×13557131² = 367591601902322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13557131.

It is not an unprimeable number, because it can be changed into a prime (13557151) 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, 968360 + ... + 968373.

It is an arithmetic number, because the mean of its divisors is an integer number (3873468).

Almost surely, 2^13557131 is an apocalyptic number.

13557131 is a deficient number, since it is larger than the sum of its proper divisors (1936741).

13557131 is an equidigital number, since it uses as much as digits as its factorization.

13557131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1936740.

The product of its digits is 1575, while the sum is 26.

The square root of 13557131 is about 3682.0009505702. Note that the first 3 decimals coincide. The cubic root of 13557131 is about 238.4455732714.

The spelling of 13557131 in words is "thirteen million, five hundred fifty-seven thousand, one hundred thirty-one".