256061017 has 4 divisors (see below), whose sum is σ = 256206096. Its totient is φ = 255915940.

The previous prime is 256061011. The next prime is 256061063. The reversal of 256061017 is 710160652.

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 a de Polignac number, because none of the positive numbers 2^k-256061017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256061011) 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, 69859 + ... + 73432.

It is an arithmetic number, because the mean of its divisors is an integer number (64051524).

Almost surely, 2^256061017 is an apocalyptic number.

It is an amenable number.

256061017 is a deficient number, since it is larger than the sum of its proper divisors (145079).

256061017 is a wasteful number, since it uses less digits than its factorization.

256061017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145078.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 256061017 is about 16001.9066676443. The cubic root of 256061017 is about 635.0108638892.

The spelling of 256061017 in words is "two hundred fifty-six million, sixty-one thousand, seventeen".