256354617 has 4 divisors (see below), whose sum is σ = 341806160. Its totient is φ = 170903076.

The previous prime is 256354613. The next prime is 256354633. The reversal of 256354617 is 716453652.

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 not a de Polignac number, because 256354617 - 2² = 256354613 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256354613) 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, 42725767 + ... + 42725772.

It is an arithmetic number, because the mean of its divisors is an integer number (85451540).

Almost surely, 2^256354617 is an apocalyptic number.

It is an amenable number.

256354617 is a deficient number, since it is larger than the sum of its proper divisors (85451543).

256354617 is an equidigital number, since it uses as much as digits as its factorization.

256354617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85451542.

The product of its digits is 151200, while the sum is 39.

The square root of 256354617 is about 16011.0779462221. The cubic root of 256354617 is about 635.2534727018.

The spelling of 256354617 in words is "two hundred fifty-six million, three hundred fifty-four thousand, six hundred seventeen".