256451873 has 12 divisors (see below), whose sum is σ = 271302480. Its totient is φ = 242378136.

The previous prime is 256451861. The next prime is 256451879. The reversal of 256451873 is 378154652.

It is not a de Polignac number, because 256451873 - 2⁴ = 256451857 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 256451873.

It is not an unprimeable number, because it can be changed into a prime (256451879) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 298118 + ... + 298976.

It is an arithmetic number, because the mean of its divisors is an integer number (22608540).

Almost surely, 2^256451873 is an apocalyptic number.

It is an amenable number.

256451873 is a deficient number, since it is larger than the sum of its proper divisors (14850607).

256451873 is an equidigital number, since it uses as much as digits as its factorization.

256451873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724 (or 1705 counting only the distinct ones).

The product of its digits is 201600, while the sum is 41.

The square root of 256451873 is about 16014.1148053834. The cubic root of 256451873 is about 635.3337968521. Note that the first 3 decimals are identical.

The spelling of 256451873 in words is "two hundred fifty-six million, four hundred fifty-one thousand, eight hundred seventy-three".