256424217 has 32 divisors (see below), whose sum is σ = 408913920. Its totient is φ = 139751040.

The previous prime is 256424213. The next prime is 256424221. The reversal of 256424217 is 712424652.

256424217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (256424213) and next prime (256424221).

It is not a de Polignac number, because 256424217 - 2² = 256424213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256424213) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 251134 + ... + 252152.

It is an arithmetic number, because the mean of its divisors is an integer number (12778560).

Almost surely, 2^256424217 is an apocalyptic number.

It is an amenable number.

256424217 is a deficient number, since it is larger than the sum of its proper divisors (152489703).

256424217 is a wasteful number, since it uses less digits than its factorization.

256424217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573.

The product of its digits is 26880, while the sum is 33.

The square root of 256424217 is about 16013.2512938504. The cubic root of 256424217 is about 635.3109577089.

Adding to 256424217 its reverse (712424652), we get a palindrome (968848869).

The spelling of 256424217 in words is "two hundred fifty-six million, four hundred twenty-four thousand, two hundred seventeen".