256020171 has 8 divisors (see below), whose sum is σ = 372393024. Its totient is φ = 155163720.

The previous prime is 256020161. The next prime is 256020197. The reversal of 256020171 is 171020652.

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

It is not a de Polignac number, because 256020171 - 2⁷ = 256020043 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256020101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3879061 + ... + 3879126.

It is an arithmetic number, because the mean of its divisors is an integer number (46549128).

Almost surely, 2^256020171 is an apocalyptic number.

256020171 is a deficient number, since it is larger than the sum of its proper divisors (116372853).

256020171 is a wasteful number, since it uses less digits than its factorization.

256020171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7758201.

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 256020171 is about 16000.6303313338. The cubic root of 256020171 is about 634.9770971548.

The spelling of 256020171 in words is "two hundred fifty-six million, twenty thousand, one hundred seventy-one".