256191267 has 4 divisors (see below), whose sum is σ = 341588360. Its totient is φ = 170794176.

The previous prime is 256191263. The next prime is 256191283. The reversal of 256191267 is 762191652.

256191267 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 256191267 - 2² = 256191263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256191263) 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, 42698542 + ... + 42698547.

It is an arithmetic number, because the mean of its divisors is an integer number (85397090).

Almost surely, 2^256191267 is an apocalyptic number.

256191267 is a deficient number, since it is larger than the sum of its proper divisors (85397093).

256191267 is an equidigital number, since it uses as much as digits as its factorization.

256191267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85397092.

The product of its digits is 45360, while the sum is 39.

The square root of 256191267 is about 16005.9759777403. The cubic root of 256191267 is about 635.1185155028.

The spelling of 256191267 in words is "two hundred fifty-six million, one hundred ninety-one thousand, two hundred sixty-seven".