13431257 has 8 divisors (see below), whose sum is σ = 15523200. Its totient is φ = 11382624.

The previous prime is 13431251. The next prime is 13431323. The reversal of 13431257 is 75213431.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13431257 - 2¹⁴ = 13414873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13431251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10157 + ... + 11402.

It is an arithmetic number, because the mean of its divisors is an integer number (1940400).

Almost surely, 2^13431257 is an apocalyptic number.

It is an amenable number.

13431257 is a deficient number, since it is larger than the sum of its proper divisors (2091943).

13431257 is an equidigital number, since it uses as much as digits as its factorization.

13431257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21655.

The product of its digits is 2520, while the sum is 26.

The square root of 13431257 is about 3664.8679375934. The cubic root of 13431257 is about 237.7053116597.

Adding to 13431257 its reverse (75213431), we get a palindrome (88644688).

The spelling of 13431257 in words is "thirteen million, four hundred thirty-one thousand, two hundred fifty-seven".