256394057 has 2 divisors, whose sum is σ = 256394058. Its totient is φ = 256394056.

The previous prime is 256394023. The next prime is 256394063. The reversal of 256394057 is 750493652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135745801 + 120648256 = 11651^2 + 10984^2 .

It is a cyclic number.

It is not a de Polignac number, because 256394057 - 2⁸ = 256393801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256394557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128197028 + 128197029.

It is an arithmetic number, because the mean of its divisors is an integer number (128197029).

Almost surely, 2^256394057 is an apocalyptic number.

It is an amenable number.

256394057 is a deficient number, since it is larger than the sum of its proper divisors (1).

256394057 is an equidigital number, since it uses as much as digits as its factorization.

256394057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 256394057 is about 16012.3095460961. The cubic root of 256394057 is about 635.2860488164.

The spelling of 256394057 in words is "two hundred fifty-six million, three hundred ninety-four thousand, fifty-seven".