256250881 has 4 divisors (see below), whose sum is σ = 256608000. Its totient is φ = 255893764.

The previous prime is 256250879. The next prime is 256250899. The reversal of 256250881 is 188052652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256250881 - 2¹ = 256250879 is a prime.

It is a super-2 number, since 2×256250881² = 131329028026552322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256250881.

It is not an unprimeable number, because it can be changed into a prime (256250801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177481 + ... + 178918.

It is an arithmetic number, because the mean of its divisors is an integer number (64152000).

Almost surely, 2^256250881 is an apocalyptic number.

It is an amenable number.

256250881 is a deficient number, since it is larger than the sum of its proper divisors (357119).

256250881 is an equidigital number, since it uses as much as digits as its factorization.

256250881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357118.

The product of its (nonzero) digits is 38400, while the sum is 37.

The square root of 256250881 is about 16007.8381113753. The cubic root of 256250881 is about 635.1677742972.

The spelling of 256250881 in words is "two hundred fifty-six million, two hundred fifty thousand, eight hundred eighty-one".