256897337 has 2 divisors, whose sum is σ = 256897338. Its totient is φ = 256897336.

The previous prime is 256897313. The next prime is 256897379. The reversal of 256897337 is 733798652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 220849321 + 36048016 = 14861^2 + 6004^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256897337 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256897397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128448668 + 128448669.

It is an arithmetic number, because the mean of its divisors is an integer number (128448669).

Almost surely, 2^256897337 is an apocalyptic number.

It is an amenable number.

256897337 is a deficient number, since it is larger than the sum of its proper divisors (1).

256897337 is an equidigital number, since it uses as much as digits as its factorization.

256897337 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 50.

The square root of 256897337 is about 16028.0172510514. The cubic root of 256897337 is about 635.7014481894.

The spelling of 256897337 in words is "two hundred fifty-six million, eight hundred ninety-seven thousand, three hundred thirty-seven".