256504373 has 2 divisors, whose sum is σ = 256504374. Its totient is φ = 256504372.

The previous prime is 256504363. The next prime is 256504393. The reversal of 256504373 is 373405652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 178676689 + 77827684 = 13367^2 + 8822^2 .

It is a cyclic number.

It is not a de Polignac number, because 256504373 - 2⁶ = 256504309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256504363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128252186 + 128252187.

It is an arithmetic number, because the mean of its divisors is an integer number (128252187).

Almost surely, 2^256504373 is an apocalyptic number.

It is an amenable number.

256504373 is a deficient number, since it is larger than the sum of its proper divisors (1).

256504373 is an equidigital number, since it uses as much as digits as its factorization.

256504373 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 35.

The square root of 256504373 is about 16015.7539004569. The cubic root of 256504373 is about 635.3771483890.

The spelling of 256504373 in words is "two hundred fifty-six million, five hundred four thousand, three hundred seventy-three".