520171990 has 32 divisors (see below), whose sum is σ = 1012578336. Its totient is φ = 191255040.

The previous prime is 520171943. The next prime is 520171997. The reversal of 520171990 is 99171025.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (520171997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23029 + ... + 39631.

It is an arithmetic number, because the mean of its divisors is an integer number (31643073).

Almost surely, 2^520171990 is an apocalyptic number.

520171990 is a deficient number, since it is larger than the sum of its proper divisors (492406346).

520171990 is a wasteful number, since it uses less digits than its factorization.

520171990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16864.

The product of its (nonzero) digits is 5670, while the sum is 34.

The square root of 520171990 is about 22807.2793204275. The cubic root of 520171990 is about 804.2337989481.

The spelling of 520171990 in words is "five hundred twenty million, one hundred seventy-one thousand, nine hundred ninety".