256101257 has 2 divisors, whose sum is σ = 256101258. Its totient is φ = 256101256.

The previous prime is 256101227. The next prime is 256101283. The reversal of 256101257 is 752101652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196672576 + 59428681 = 14024^2 + 7709^2 .

It is a cyclic number.

It is not a de Polignac number, because 256101257 - 2⁶ = 256101193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256101217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128050628 + 128050629.

It is an arithmetic number, because the mean of its divisors is an integer number (128050629).

Almost surely, 2^256101257 is an apocalyptic number.

It is an amenable number.

256101257 is a deficient number, since it is larger than the sum of its proper divisors (1).

256101257 is an equidigital number, since it uses as much as digits as its factorization.

256101257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200, while the sum is 29.

The square root of 256101257 is about 16003.1639684157. The cubic root of 256101257 is about 635.0441261419.

The spelling of 256101257 in words is "two hundred fifty-six million, one hundred one thousand, two hundred fifty-seven".