256033139 has 2 divisors, whose sum is σ = 256033140. Its totient is φ = 256033138.

The previous prime is 256033133. The next prime is 256033157. The reversal of 256033139 is 931330652.

256033139 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 256033139 - 2²⁰ = 254984563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (256033133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128016569 + 128016570.

It is an arithmetic number, because the mean of its divisors is an integer number (128016570).

Almost surely, 2^256033139 is an apocalyptic number.

256033139 is a deficient number, since it is larger than the sum of its proper divisors (1).

256033139 is an equidigital number, since it uses as much as digits as its factorization.

256033139 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 32.

The square root of 256033139 is about 16001.0355602380. The cubic root of 256033139 is about 634.9878179819.

The spelling of 256033139 in words is "two hundred fifty-six million, thirty-three thousand, one hundred thirty-nine".