256497297 has 32 divisors (see below), whose sum is σ = 397108224. Its totient is φ = 144244800.

The previous prime is 256497287. The next prime is 256497299. The reversal of 256497297 is 792794652.

It is not a de Polignac number, because 256497297 - 2⁸ = 256497041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256497299) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 473847 + ... + 474387.

It is an arithmetic number, because the mean of its divisors is an integer number (12409632).

Almost surely, 2^256497297 is an apocalyptic number.

It is an amenable number.

256497297 is a deficient number, since it is larger than the sum of its proper divisors (140610927).

256497297 is a wasteful number, since it uses less digits than its factorization.

256497297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869.

The product of its digits is 1905120, while the sum is 51.

The square root of 256497297 is about 16015.5329914430. The cubic root of 256497297 is about 635.3713057725.

The spelling of 256497297 in words is "two hundred fifty-six million, four hundred ninety-seven thousand, two hundred ninety-seven".