520171999 has 8 divisors (see below), whose sum is σ = 524288160. Its totient is φ = 516071136.

The previous prime is 520171997. The next prime is 520172017. The reversal of 520171999 is 999171025.

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

It is a cyclic number.

It is not a de Polignac number, because 520171999 - 2¹ = 520171997 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 69942 + ... + 77020.

It is an arithmetic number, because the mean of its divisors is an integer number (65536020).

Almost surely, 2^520171999 is an apocalyptic number.

520171999 is a deficient number, since it is larger than the sum of its proper divisors (4116161).

520171999 is a wasteful number, since it uses less digits than its factorization.

520171999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7649.

The product of its (nonzero) digits is 51030, while the sum is 43.

The square root of 520171999 is about 22807.2795177329. The cubic root of 520171999 is about 804.2338035864.

The spelling of 520171999 in words is "five hundred twenty million, one hundred seventy-one thousand, nine hundred ninety-nine".