256031357 has 2 divisors, whose sum is σ = 256031358. Its totient is φ = 256031356.

The previous prime is 256031353. The next prime is 256031371. The reversal of 256031357 is 753130652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 192127321 + 63904036 = 13861^2 + 7994^2 .

It is a cyclic number.

It is not a de Polignac number, because 256031357 - 2² = 256031353 is a prime.

It is a super-2 number, since 2×256031357² = 131104111534522898, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256031353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128015678 + 128015679.

It is an arithmetic number, because the mean of its divisors is an integer number (128015679).

Almost surely, 2^256031357 is an apocalyptic number.

It is an amenable number.

256031357 is a deficient number, since it is larger than the sum of its proper divisors (1).

256031357 is an equidigital number, since it uses as much as digits as its factorization.

256031357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 32.

The square root of 256031357 is about 16000.9798762451. The cubic root of 256031357 is about 634.9863447990.

The spelling of 256031357 in words is "two hundred fifty-six million, thirty-one thousand, three hundred fifty-seven".