256657241 has 2 divisors, whose sum is σ = 256657242. Its totient is φ = 256657240.

The previous prime is 256657237. The next prime is 256657249. The reversal of 256657241 is 142756652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 255840025 + 817216 = 15995^2 + 904^2 .

It is a cyclic number.

It is not a de Polignac number, because 256657241 - 2² = 256657237 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 256657195 and 256657204.

It is not a weakly prime, because it can be changed into another prime (256657249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128328620 + 128328621.

It is an arithmetic number, because the mean of its divisors is an integer number (128328621).

Almost surely, 2^256657241 is an apocalyptic number.

It is an amenable number.

256657241 is a deficient number, since it is larger than the sum of its proper divisors (1).

256657241 is an equidigital number, since it uses as much as digits as its factorization.

256657241 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100800, while the sum is 38.

The square root of 256657241 is about 16020.5256155970. The cubic root of 256657241 is about 635.5033444768.

The spelling of 256657241 in words is "two hundred fifty-six million, six hundred fifty-seven thousand, two hundred forty-one".