256097431 has 4 divisors (see below), whose sum is σ = 260929512. Its totient is φ = 251265352.

The previous prime is 256097419. The next prime is 256097453. The reversal of 256097431 is 134790652.

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

It is a cyclic number.

It is not a de Polignac number, because 256097431 - 2⁵ = 256097399 is a prime.

It is a super-2 number, since 2×256097431² = 131171788329599522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256067431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2415961 + ... + 2416066.

It is an arithmetic number, because the mean of its divisors is an integer number (65232378).

Almost surely, 2^256097431 is an apocalyptic number.

256097431 is a deficient number, since it is larger than the sum of its proper divisors (4832081).

256097431 is an equidigital number, since it uses as much as digits as its factorization.

256097431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832080.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 256097431 is about 16003.0444291079. The cubic root of 256097431 is about 635.0409637326.

The spelling of 256097431 in words is "two hundred fifty-six million, ninety-seven thousand, four hundred thirty-one".