13318731 has 6 divisors (see below), whose sum is σ = 19238180. Its totient is φ = 8879148.

The previous prime is 13318709. The next prime is 13318757. The reversal of 13318731 is 13781331.

It is not a de Polignac number, because 13318731 - 2⁵ = 13318699 is a prime.

It is a super-2 number, since 2×13318731² = 354777190900722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13318695 and 13318704.

It is not an unprimeable number, because it can be changed into a prime (13318231) 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 in 5 ways as a sum of consecutive naturals, for example, 739921 + ... + 739938.

Almost surely, 2^13318731 is an apocalyptic number.

13318731 is a deficient number, since it is larger than the sum of its proper divisors (5919449).

13318731 is a wasteful number, since it uses less digits than its factorization.

13318731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479865 (or 1479862 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 13318731 is about 3649.4836621089. The cubic root of 13318731 is about 237.0396237761.

The spelling of 13318731 in words is "thirteen million, three hundred eighteen thousand, seven hundred thirty-one".