509112921 has 4 divisors (see below), whose sum is σ = 678817232. Its totient is φ = 339408612.

The previous prime is 509112917. The next prime is 509112931. The reversal of 509112921 is 129211905.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 509112921 - 2² = 509112917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (509112911) 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, 84852151 + ... + 84852156.

It is an arithmetic number, because the mean of its divisors is an integer number (169704308).

Almost surely, 2^509112921 is an apocalyptic number.

It is an amenable number.

509112921 is a deficient number, since it is larger than the sum of its proper divisors (169704311).

509112921 is a wasteful number, since it uses less digits than its factorization.

509112921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169704310.

The product of its (nonzero) digits is 1620, while the sum is 30.

The square root of 509112921 is about 22563.5307742383. The cubic root of 509112921 is about 798.4934777902.

The spelling of 509112921 in words is "five hundred nine million, one hundred twelve thousand, nine hundred twenty-one".