256553171 has 24 divisors (see below), whose sum is σ = 320399280. Its totient is φ = 204083712.

The previous prime is 256553161. The next prime is 256553173. The reversal of 256553171 is 171355652.

It is not a de Polignac number, because 256553171 - 2⁶ = 256553107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256553173) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58700 + ... + 62918.

It is an arithmetic number, because the mean of its divisors is an integer number (13349970).

Almost surely, 2^256553171 is an apocalyptic number.

256553171 is a deficient number, since it is larger than the sum of its proper divisors (63846109).

256553171 is a wasteful number, since it uses less digits than its factorization.

256553171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4323 (or 4316 counting only the distinct ones).

The product of its digits is 31500, while the sum is 35.

The square root of 256553171 is about 16017.2772655030. The cubic root of 256553171 is about 635.4174377192.

The spelling of 256553171 in words is "two hundred fifty-six million, five hundred fifty-three thousand, one hundred seventy-one".