13157231 has 2 divisors, whose sum is σ = 13157232. Its totient is φ = 13157230.

The previous prime is 13157191. The next prime is 13157239. The reversal of 13157231 is 13275131.

It is a strong prime.

It is an emirp because it is prime and its reverse (13275131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13157231 - 2¹⁸ = 12895087 is a prime.

It is a super-2 number, since 2×13157231² = 346225455174722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13157197 and 13157206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13157239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6578615 + 6578616.

It is an arithmetic number, because the mean of its divisors is an integer number (6578616).

Almost surely, 2^13157231 is an apocalyptic number.

13157231 is a deficient number, since it is larger than the sum of its proper divisors (1).

13157231 is an equidigital number, since it uses as much as digits as its factorization.

13157231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 630, while the sum is 23.

The square root of 13157231 is about 3627.2897595863. The cubic root of 13157231 is about 236.0776281542.

The spelling of 13157231 in words is "thirteen million, one hundred fifty-seven thousand, two hundred thirty-one".