256109417 has 8 divisors (see below), whose sum is σ = 271004160. Its totient is φ = 241356240.

The previous prime is 256109407. The next prime is 256109461. The reversal of 256109417 is 714901652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256109417 - 2⁴ = 256109401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256109407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31658 + ... + 38915.

It is an arithmetic number, because the mean of its divisors is an integer number (33875520).

Almost surely, 2^256109417 is an apocalyptic number.

It is an amenable number.

256109417 is a deficient number, since it is larger than the sum of its proper divisors (14894743).

256109417 is a wasteful number, since it uses less digits than its factorization.

256109417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70783.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 256109417 is about 16003.4189159692. The cubic root of 256109417 is about 635.0508707463.

The spelling of 256109417 in words is "two hundred fifty-six million, one hundred nine thousand, four hundred seventeen".