13012731 has 10 divisors (see below), whose sum is σ = 19438892. Its totient is φ = 8675100.

The previous prime is 13012723. The next prime is 13012751. The reversal of 13012731 is 13721031.

It is not a de Polignac number, because 13012731 - 2³ = 13012723 is a prime.

It is a super-2 number, since 2×13012731² = 338662336156722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13012721) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 80245 + ... + 80406.

Almost surely, 2^13012731 is an apocalyptic number.

13012731 is a deficient number, since it is larger than the sum of its proper divisors (6426161).

13012731 is an equidigital number, since it uses as much as digits as its factorization.

13012731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160663 (or 160654 counting only the distinct ones).

The product of its (nonzero) digits is 126, while the sum is 18.

The square root of 13012731 is about 3607.3163154900. The cubic root of 13012731 is about 235.2101997347.

Adding to 13012731 its reverse (13721031), we get a palindrome (26733762).

The spelling of 13012731 in words is "thirteen million, twelve thousand, seven hundred thirty-one".