256907017 has 2 divisors, whose sum is σ = 256907018. Its totient is φ = 256907016.

The previous prime is 256907003. The next prime is 256907041. The reversal of 256907017 is 710709652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156025081 + 100881936 = 12491^2 + 10044^2 .

It is a cyclic number.

It is not a de Polignac number, because 256907017 - 2¹⁵ = 256874249 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256907047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128453508 + 128453509.

It is an arithmetic number, because the mean of its divisors is an integer number (128453509).

Almost surely, 2^256907017 is an apocalyptic number.

It is an amenable number.

256907017 is a deficient number, since it is larger than the sum of its proper divisors (1).

256907017 is an equidigital number, since it uses as much as digits as its factorization.

256907017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 26460, while the sum is 37.

The square root of 256907017 is about 16028.3192194316. The cubic root of 256907017 is about 635.7094325887.

The spelling of 256907017 in words is "two hundred fifty-six million, nine hundred seven thousand, seventeen".