256433497 has 2 divisors, whose sum is σ = 256433498. Its totient is φ = 256433496.

The previous prime is 256433483. The next prime is 256433531. The reversal of 256433497 is 794334652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153289161 + 103144336 = 12381^2 + 10156^2 .

It is a cyclic number.

It is not a de Polignac number, because 256433497 - 2⁷ = 256433369 is a prime.

It is not a weakly prime, because it can be changed into another prime (256433407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128216748 + 128216749.

It is an arithmetic number, because the mean of its divisors is an integer number (128216749).

Almost surely, 2^256433497 is an apocalyptic number.

It is an amenable number.

256433497 is a deficient number, since it is larger than the sum of its proper divisors (1).

256433497 is an equidigital number, since it uses as much as digits as its factorization.

256433497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 43.

The square root of 256433497 is about 16013.5410512478. The cubic root of 256433497 is about 635.3186215906.

The spelling of 256433497 in words is "two hundred fifty-six million, four hundred thirty-three thousand, four hundred ninety-seven".