13256987 has 2 divisors, whose sum is σ = 13256988. Its totient is φ = 13256986.

The previous prime is 13256963. The next prime is 13257007. The reversal of 13256987 is 78965231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13256987 - 2²⁰ = 12208411 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13253987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6628493 + 6628494.

It is an arithmetic number, because the mean of its divisors is an integer number (6628494).

Almost surely, 2^13256987 is an apocalyptic number.

13256987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13256987 is an equidigital number, since it uses as much as digits as its factorization.

13256987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 41.

The square root of 13256987 is about 3641.0145564114. The cubic root of 13256987 is about 236.6727607591.

The spelling of 13256987 in words is "thirteen million, two hundred fifty-six thousand, nine hundred eighty-seven".