13072731 has 32 divisors (see below), whose sum is σ = 21086208. Its totient is φ = 7045920.

The previous prime is 13072699. The next prime is 13072739. The reversal of 13072731 is 13727031.

13072731 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13072731 - 2⁵ = 13072699 is a prime.

It is a super-2 number, since 2×13072731² = 341792591596722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13072739) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27760 + ... + 28226.

It is an arithmetic number, because the mean of its divisors is an integer number (658944).

Almost surely, 2^13072731 is an apocalyptic number.

13072731 is a deficient number, since it is larger than the sum of its proper divisors (8013477).

13072731 is a wasteful number, since it uses less digits than its factorization.

13072731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 13072731 is about 3615.6231827999. The cubic root of 13072731 is about 235.5711533502.

Adding to 13072731 its reverse (13727031), we get a palindrome (26799762).

The spelling of 13072731 in words is "thirteen million, seventy-two thousand, seven hundred thirty-one".