256159139 has 2 divisors, whose sum is σ = 256159140. Its totient is φ = 256159138.

The previous prime is 256159133. The next prime is 256159153. The reversal of 256159139 is 931951652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256159139 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256159096 and 256159105.

It is not a weakly prime, because it can be changed into another prime (256159133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128079569 + 128079570.

It is an arithmetic number, because the mean of its divisors is an integer number (128079570).

Almost surely, 2^256159139 is an apocalyptic number.

256159139 is a deficient number, since it is larger than the sum of its proper divisors (1).

256159139 is an equidigital number, since it uses as much as digits as its factorization.

256159139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72900, while the sum is 41.

The square root of 256159139 is about 16004.9723211257. The cubic root of 256159139 is about 635.0919651043.

The spelling of 256159139 in words is "two hundred fifty-six million, one hundred fifty-nine thousand, one hundred thirty-nine".