256308481 has 16 divisors (see below), whose sum is σ = 314213760. Its totient is φ = 205729920.

The previous prime is 256308419. The next prime is 256308497. The reversal of 256308481 is 184803652.

It is a happy number.

256308481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256308481 - 2¹⁷ = 256177409 is a prime.

It is a super-2 number, since 2×256308481² = 131388074865054722, 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 256308481.

It is not an unprimeable number, because it can be changed into a prime (256308281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35676 + ... + 42253.

It is an arithmetic number, because the mean of its divisors is an integer number (19638360).

Almost surely, 2^256308481 is an apocalyptic number.

It is an amenable number.

256308481 is a deficient number, since it is larger than the sum of its proper divisors (57905279).

256308481 is a wasteful number, since it uses less digits than its factorization.

256308481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77976.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 256308481 is about 16009.6371289296. The cubic root of 256308481 is about 635.2153616755.

The spelling of 256308481 in words is "two hundred fifty-six million, three hundred eight thousand, four hundred eighty-one".