256308497 has 2 divisors, whose sum is σ = 256308498. Its totient is φ = 256308496.

The previous prime is 256308419. The next prime is 256308523. The reversal of 256308497 is 794803652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 253319056 + 2989441 = 15916^2 + 1729^2 .

It is a cyclic number.

It is not a de Polignac number, because 256308497 - 2¹² = 256304401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (256358497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128154248 + 128154249.

It is an arithmetic number, because the mean of its divisors is an integer number (128154249).

Almost surely, 2^256308497 is an apocalyptic number.

It is an amenable number.

256308497 is a deficient number, since it is larger than the sum of its proper divisors (1).

256308497 is an equidigital number, since it uses as much as digits as its factorization.

256308497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 256308497 is about 16009.6376286286. The cubic root of 256308497 is about 635.2153748933.

The spelling of 256308497 in words is "two hundred fifty-six million, three hundred eight thousand, four hundred ninety-seven".