256281641 has 16 divisors (see below), whose sum is σ = 323118720. Its totient is φ = 197450880.

The previous prime is 256281637. The next prime is 256281643. The reversal of 256281641 is 146182652.

It is not a de Polignac number, because 256281641 - 2² = 256281637 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256281643) 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 15 ways as a sum of consecutive naturals, for example, 11846 + ... + 25551.

It is an arithmetic number, because the mean of its divisors is an integer number (20194920).

Almost surely, 2^256281641 is an apocalyptic number.

It is an amenable number.

256281641 is a deficient number, since it is larger than the sum of its proper divisors (66837079).

256281641 is a wasteful number, since it uses less digits than its factorization.

256281641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37504.

The product of its digits is 23040, while the sum is 35.

The square root of 256281641 is about 16008.7988618759. The cubic root of 256281641 is about 635.1931881663.

The spelling of 256281641 in words is "two hundred fifty-six million, two hundred eighty-one thousand, six hundred forty-one".