256467257 has 2 divisors, whose sum is σ = 256467258. Its totient is φ = 256467256.

The previous prime is 256467221. The next prime is 256467347. The reversal of 256467257 is 752764652.

256467257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237899776 + 18567481 = 15424^2 + 4309^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256467257 is a prime.

It is not a weakly prime, because it can be changed into another prime (256467157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128233628 + 128233629.

It is an arithmetic number, because the mean of its divisors is an integer number (128233629).

Almost surely, 2^256467257 is an apocalyptic number.

It is an amenable number.

256467257 is a deficient number, since it is larger than the sum of its proper divisors (1).

256467257 is an equidigital number, since it uses as much as digits as its factorization.

256467257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 705600, while the sum is 44.

The square root of 256467257 is about 16014.5951244482. The cubic root of 256467257 is about 635.3465007038.

The spelling of 256467257 in words is "two hundred fifty-six million, four hundred sixty-seven thousand, two hundred fifty-seven".