256481049 has 16 divisors (see below), whose sum is σ = 374065920. Its totient is φ = 155025360.

The previous prime is 256480969. The next prime is 256481051. The reversal of 256481049 is 940184652.

It is not a de Polignac number, because 256481049 - 2²⁰ = 255432473 is a prime.

It is a super-2 number, since 2×256481049² = 131565056992280802, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256480998 and 256481016.

It is not an unprimeable number, because it can be changed into a prime (256481089) 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, 2254 + ... + 22760.

It is an arithmetic number, because the mean of its divisors is an integer number (23379120).

Almost surely, 2^256481049 is an apocalyptic number.

It is an amenable number.

256481049 is a deficient number, since it is larger than the sum of its proper divisors (117584871).

256481049 is a wasteful number, since it uses less digits than its factorization.

256481049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20900.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 256481049 is about 16015.0257258613. The cubic root of 256481049 is about 635.3578894765.

The spelling of 256481049 in words is "two hundred fifty-six million, four hundred eighty-one thousand, forty-nine".