256296731 has 2 divisors, whose sum is σ = 256296732. Its totient is φ = 256296730.

The previous prime is 256296721. The next prime is 256296739. The reversal of 256296731 is 137692652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256296731 - 2¹⁴ = 256280347 is a prime.

It is a super-2 number, since 2×256296731² = 131376028642572722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (256296739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128148365 + 128148366.

It is an arithmetic number, because the mean of its divisors is an integer number (128148366).

Almost surely, 2^256296731 is an apocalyptic number.

256296731 is a deficient number, since it is larger than the sum of its proper divisors (1).

256296731 is an equidigital number, since it uses as much as digits as its factorization.

256296731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 41.

The square root of 256296731 is about 16009.2701582552. The cubic root of 256296731 is about 635.2056547597.

The spelling of 256296731 in words is "two hundred fifty-six million, two hundred ninety-six thousand, seven hundred thirty-one".