521272171 has 4 divisors (see below), whose sum is σ = 595739632. Its totient is φ = 446804712.

The previous prime is 521272151. The next prime is 521272177. The reversal of 521272171 is 171272125.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521272171 - 2⁹ = 521271659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521272177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37233720 + ... + 37233733.

It is an arithmetic number, because the mean of its divisors is an integer number (148934908).

Almost surely, 2^521272171 is an apocalyptic number.

521272171 is a deficient number, since it is larger than the sum of its proper divisors (74467461).

521272171 is an equidigital number, since it uses as much as digits as its factorization.

521272171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74467460.

The product of its digits is 1960, while the sum is 28.

The square root of 521272171 is about 22831.3856565912. The cubic root of 521272171 is about 804.8003933941.

The spelling of 521272171 in words is "five hundred twenty-one million, two hundred seventy-two thousand, one hundred seventy-one".