256591443 has 4 divisors (see below), whose sum is σ = 342121928. Its totient is φ = 171060960.

The previous prime is 256591399. The next prime is 256591469. The reversal of 256591443 is 344195652.

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

It is not a de Polignac number, because 256591443 - 2⁸ = 256591187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256591343) 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, 42765238 + ... + 42765243.

It is an arithmetic number, because the mean of its divisors is an integer number (85530482).

Almost surely, 2^256591443 is an apocalyptic number.

256591443 is a deficient number, since it is larger than the sum of its proper divisors (85530485).

256591443 is an equidigital number, since it uses as much as digits as its factorization.

256591443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85530484.

The product of its digits is 129600, while the sum is 39.

The square root of 256591443 is about 16018.4719308678. The cubic root of 256591443 is about 635.4490328422.

The spelling of 256591443 in words is "two hundred fifty-six million, five hundred ninety-one thousand, four hundred forty-three".