256515937 has 2 divisors, whose sum is σ = 256515938. Its totient is φ = 256515936.

The previous prime is 256515929. The next prime is 256515943. The reversal of 256515937 is 739515652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 252206161 + 4309776 = 15881^2 + 2076^2 .

It is a cyclic number.

It is not a de Polignac number, because 256515937 - 2³ = 256515929 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256515893 and 256515902.

It is not a weakly prime, because it can be changed into another prime (256515437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128257968 + 128257969.

It is an arithmetic number, because the mean of its divisors is an integer number (128257969).

Almost surely, 2^256515937 is an apocalyptic number.

It is an amenable number.

256515937 is a deficient number, since it is larger than the sum of its proper divisors (1).

256515937 is an equidigital number, since it uses as much as digits as its factorization.

256515937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 283500, while the sum is 43.

The square root of 256515937 is about 16016.1149159214. The cubic root of 256515937 is about 635.3866964925.

The spelling of 256515937 in words is "two hundred fifty-six million, five hundred fifteen thousand, nine hundred thirty-seven".