255695731 has 2 divisors, whose sum is σ = 255695732. Its totient is φ = 255695730.

The previous prime is 255695723. The next prime is 255695743. The reversal of 255695731 is 137596552.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 255695731 - 2³ = 255695723 is a prime.

It is a super-2 number, since 2×255695731² = 130760613703248722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (255695431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127847865 + 127847866.

It is an arithmetic number, because the mean of its divisors is an integer number (127847866).

Almost surely, 2^255695731 is an apocalyptic number.

255695731 is a deficient number, since it is larger than the sum of its proper divisors (1).

255695731 is an equidigital number, since it uses as much as digits as its factorization.

255695731 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 255695731 is about 15990.4887667638. The cubic root of 255695731 is about 634.7087601557.

The spelling of 255695731 in words is "two hundred fifty-five million, six hundred ninety-five thousand, seven hundred thirty-one".