15256139 has 2 divisors, whose sum is σ = 15256140. Its totient is φ = 15256138.

The previous prime is 15256133. The next prime is 15256159. The reversal of 15256139 is 93165251.

15256139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15256139 - 2⁸ = 15255883 is a prime.

It is not a weakly prime, because it can be changed into another prime (15256133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7628069 + 7628070.

It is an arithmetic number, because the mean of its divisors is an integer number (7628070).

Almost surely, 2^15256139 is an apocalyptic number.

15256139 is a deficient number, since it is larger than the sum of its proper divisors (1).

15256139 is an equidigital number, since it uses as much as digits as its factorization.

15256139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 32.

The square root of 15256139 is about 3905.9107772708. The cubic root of 15256139 is about 248.0170546284.

The spelling of 15256139 in words is "fifteen million, two hundred fifty-six thousand, one hundred thirty-nine".