256545873 has 10 divisors (see below), whose sum is σ = 383235314. Its totient is φ = 171030528.

The previous prime is 256545851. The next prime is 256545899. The reversal of 256545873 is 378545652.

256545873 is a `hidden beast` number, since 2 + 5 + 65 + 4 + 587 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 252905409 + 3640464 = 15903^2 + 1908^2 .

It is not a de Polignac number, because 256545873 - 2⁸ = 256545617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256545823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1583536 + ... + 1583697.

Almost surely, 2^256545873 is an apocalyptic number.

It is an amenable number.

256545873 is a deficient number, since it is larger than the sum of its proper divisors (126689441).

256545873 is an equidigital number, since it uses as much as digits as its factorization.

256545873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167245 (or 3167236 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 45.

The square root of 256545873 is about 16017.0494473857. The cubic root of 256545873 is about 635.4114125608.

The spelling of 256545873 in words is "two hundred fifty-six million, five hundred forty-five thousand, eight hundred seventy-three".