13231987 has 2 divisors, whose sum is σ = 13231988. Its totient is φ = 13231986.

The previous prime is 13231973. The next prime is 13231991. The reversal of 13231987 is 78913231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13231987 is a prime.

It is equal to p₈₆₃₃₅₉ and since 13231987 and 863359 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (13231997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6615993 + 6615994.

It is an arithmetic number, because the mean of its divisors is an integer number (6615994).

Almost surely, 2^13231987 is an apocalyptic number.

13231987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13231987 is an equidigital number, since it uses as much as digits as its factorization.

13231987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9072, while the sum is 34.

The square root of 13231987 is about 3637.5798273028. The cubic root of 13231987 is about 236.5238948006.

The spelling of 13231987 in words is "thirteen million, two hundred thirty-one thousand, nine hundred eighty-seven".