509942171 has 4 divisors (see below), whose sum is σ = 509994312. Its totient is φ = 509890032.

The previous prime is 509942161. The next prime is 509942179. The reversal of 509942171 is 171249905.

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 not a de Polignac number, because 509942171 - 2¹⁸ = 509680027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509942179) 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, 6506 + ... + 32591.

It is an arithmetic number, because the mean of its divisors is an integer number (127498578).

Almost surely, 2^509942171 is an apocalyptic number.

509942171 is a deficient number, since it is larger than the sum of its proper divisors (52141).

509942171 is a wasteful number, since it uses less digits than its factorization.

509942171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52140.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 509942171 is about 22581.8991893950. The cubic root of 509942171 is about 798.9267749413.

The spelling of 509942171 in words is "five hundred nine million, nine hundred forty-two thousand, one hundred seventy-one".