256131089 has 4 divisors (see below), whose sum is σ = 256181940. Its totient is φ = 256080240.

The previous prime is 256131067. The next prime is 256131133. The reversal of 256131089 is 980131652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31730689 + 224400400 = 5633^2 + 14980^2 .

It is a cyclic number.

It is not a de Polignac number, because 256131089 - 2¹⁶ = 256065553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256131019) 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, 16922 + ... + 28259.

It is an arithmetic number, because the mean of its divisors is an integer number (64045485).

Almost surely, 2^256131089 is an apocalyptic number.

It is an amenable number.

256131089 is a deficient number, since it is larger than the sum of its proper divisors (50851).

256131089 is an equidigital number, since it uses as much as digits as its factorization.

256131089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50850.

The product of its (nonzero) digits is 12960, while the sum is 35.

The square root of 256131089 is about 16004.0960069602. The cubic root of 256131089 is about 635.0687829268.

The spelling of 256131089 in words is "two hundred fifty-six million, one hundred thirty-one thousand, eighty-nine".