256422997 has 2 divisors, whose sum is σ = 256422998. Its totient is φ = 256422996.

The previous prime is 256422977. The next prime is 256423007. The reversal of 256422997 is 799224652.

256422997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 248094001 + 8328996 = 15751^2 + 2886^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256422997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256422977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128211498 + 128211499.

It is an arithmetic number, because the mean of its divisors is an integer number (128211499).

Almost surely, 2^256422997 is an apocalyptic number.

It is an amenable number.

256422997 is a deficient number, since it is larger than the sum of its proper divisors (1).

256422997 is an equidigital number, since it uses as much as digits as its factorization.

256422997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 46.

The square root of 256422997 is about 16013.2132003543. The cubic root of 256422997 is about 635.3099501590.

The spelling of 256422997 in words is "two hundred fifty-six million, four hundred twenty-two thousand, nine hundred ninety-seven".