256376137 has 2 divisors, whose sum is σ = 256376138. Its totient is φ = 256376136.

The previous prime is 256376129. The next prime is 256376149. The reversal of 256376137 is 731673652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249134656 + 7241481 = 15784^2 + 2691^2 .

It is a cyclic number.

It is not a de Polignac number, because 256376137 - 2³ = 256376129 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256376137.

It is not a weakly prime, because it can be changed into another prime (256376437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128188068 + 128188069.

It is an arithmetic number, because the mean of its divisors is an integer number (128188069).

Almost surely, 2^256376137 is an apocalyptic number.

It is an amenable number.

256376137 is a deficient number, since it is larger than the sum of its proper divisors (1).

256376137 is an equidigital number, since it uses as much as digits as its factorization.

256376137 is an evil number, because the sum of its binary digits is even.

The product of its digits is 158760, while the sum is 40.

The square root of 256376137 is about 16011.7499668212. The cubic root of 256376137 is about 635.2712479127.

The spelling of 256376137 in words is "two hundred fifty-six million, three hundred seventy-six thousand, one hundred thirty-seven".