13087931 has 2 divisors, whose sum is σ = 13087932. Its totient is φ = 13087930.

The previous prime is 13087913. The next prime is 13087937. The reversal of 13087931 is 13978031.

Together with previous prime (13087913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (13978031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13087931 - 2²² = 8893627 is a prime.

It is a super-2 number, since 2×13087931² = 342587875721522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13087937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6543965 + 6543966.

It is an arithmetic number, because the mean of its divisors is an integer number (6543966).

Almost surely, 2^13087931 is an apocalyptic number.

13087931 is a deficient number, since it is larger than the sum of its proper divisors (1).

13087931 is an equidigital number, since it uses as much as digits as its factorization.

13087931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 13087931 is about 3617.7245611019. The cubic root of 13087931 is about 235.6624195297.

The spelling of 13087931 in words is "thirteen million, eighty-seven thousand, nine hundred thirty-one".