256425223 has 4 divisors (see below), whose sum is σ = 259068880. Its totient is φ = 253781568.

The previous prime is 256425217. The next prime is 256425227. The reversal of 256425223 is 322524652.

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 256425223 - 2¹⁷ = 256294151 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256425227) 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, 1321683 + ... + 1321876.

It is an arithmetic number, because the mean of its divisors is an integer number (64767220).

Almost surely, 2^256425223 is an apocalyptic number.

256425223 is a deficient number, since it is larger than the sum of its proper divisors (2643657).

256425223 is an equidigital number, since it uses as much as digits as its factorization.

256425223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643656.

The product of its digits is 28800, while the sum is 31.

The square root of 256425223 is about 16013.2827053044. The cubic root of 256425223 is about 635.3117885223.

Adding to 256425223 its reverse (322524652), we get a palindrome (578949875).

The spelling of 256425223 in words is "two hundred fifty-six million, four hundred twenty-five thousand, two hundred twenty-three".