256712957 has 2 divisors, whose sum is σ = 256712958. Its totient is φ = 256712956.

The previous prime is 256712947. The next prime is 256713043. The reversal of 256712957 is 759217652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196588441 + 60124516 = 14021^2 + 7754^2 .

It is a cyclic number.

It is not a de Polignac number, because 256712957 - 2¹⁸ = 256450813 is a prime.

It is a super-3 number, since 3×256712957³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256712947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128356478 + 128356479.

It is an arithmetic number, because the mean of its divisors is an integer number (128356479).

Almost surely, 2^256712957 is an apocalyptic number.

It is an amenable number.

256712957 is a deficient number, since it is larger than the sum of its proper divisors (1).

256712957 is an equidigital number, since it uses as much as digits as its factorization.

256712957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 264600, while the sum is 44.

The square root of 256712957 is about 16022.2644154938. The cubic root of 256712957 is about 635.5493268700.

The spelling of 256712957 in words is "two hundred fifty-six million, seven hundred twelve thousand, nine hundred fifty-seven".