256381122 has 8 divisors (see below), whose sum is σ = 512762256. Its totient is φ = 85460372.

The previous prime is 256381121. The next prime is 256381187. The reversal of 256381122 is 221183652.

It is a sphenic number, since it is the product of 3 distinct primes.

256381122 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 256381122.

It is not an unprimeable number, because it can be changed into a prime (256381121) 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, 21365088 + ... + 21365099.

It is an arithmetic number, because the mean of its divisors is an integer number (64095282).

Almost surely, 2^256381122 is an apocalyptic number.

256381122 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256381122 is a wasteful number, since it uses less digits than its factorization.

256381122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42730192.

The product of its digits is 5760, while the sum is 30.

The square root of 256381122 is about 16011.9056329970. The cubic root of 256381122 is about 635.2753653093.

The spelling of 256381122 in words is "two hundred fifty-six million, three hundred eighty-one thousand, one hundred twenty-two".