256225517 has 4 divisors (see below), whose sum is σ = 258620256. Its totient is φ = 253830780.

The previous prime is 256225499. The next prime is 256225531. The reversal of 256225517 is 715522652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256225517 - 2¹² = 256221421 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 (256225117) 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, 1197209 + ... + 1197422.

It is an arithmetic number, because the mean of its divisors is an integer number (64655064).

Almost surely, 2^256225517 is an apocalyptic number.

It is an amenable number.

256225517 is a deficient number, since it is larger than the sum of its proper divisors (2394739).

256225517 is a wasteful number, since it uses less digits than its factorization.

256225517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2394738.

The product of its digits is 42000, while the sum is 35.

The square root of 256225517 is about 16007.0458548728. The cubic root of 256225517 is about 635.1468170658.

The spelling of 256225517 in words is "two hundred fifty-six million, two hundred twenty-five thousand, five hundred seventeen".