256441505 has 16 divisors (see below), whose sum is σ = 312595200. Its totient is φ = 201926400.

The previous prime is 256441501. The next prime is 256441529. The reversal of 256441505 is 505144652.

It is not a de Polignac number, because 256441505 - 2² = 256441501 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256441501) 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, 157586 + ... + 159204.

It is an arithmetic number, because the mean of its divisors is an integer number (19537200).

Almost surely, 2^256441505 is an apocalyptic number.

It is an amenable number.

256441505 is a deficient number, since it is larger than the sum of its proper divisors (56153695).

256441505 is a wasteful number, since it uses less digits than its factorization.

256441505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2104.

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 256441505 is about 16013.7910876844. The cubic root of 256441505 is about 635.3252348433.

The spelling of 256441505 in words is "two hundred fifty-six million, four hundred forty-one thousand, five hundred five".