256733171 has 4 divisors (see below), whose sum is σ = 256765392. Its totient is φ = 256700952.

The previous prime is 256733063. The next prime is 256733179. The reversal of 256733171 is 171337652.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256733171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256733179) 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, 5546 + ... + 23328.

It is an arithmetic number, because the mean of its divisors is an integer number (64191348).

Almost surely, 2^256733171 is an apocalyptic number.

256733171 is a deficient number, since it is larger than the sum of its proper divisors (32221).

256733171 is a wasteful number, since it uses less digits than its factorization.

256733171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32220.

The product of its digits is 26460, while the sum is 35.

The square root of 256733171 is about 16022.8952127885. The cubic root of 256733171 is about 635.5660078315.

The spelling of 256733171 in words is "two hundred fifty-six million, seven hundred thirty-three thousand, one hundred seventy-one".