509928091 has 4 divisors (see below), whose sum is σ = 518571000. Its totient is φ = 501285184.

The previous prime is 509928049. The next prime is 509928113. The reversal of 509928091 is 190829905.

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 509928091 - 2¹⁷ = 509797019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509928011) 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, 4321366 + ... + 4321483.

It is an arithmetic number, because the mean of its divisors is an integer number (129642750).

Almost surely, 2^509928091 is an apocalyptic number.

509928091 is a deficient number, since it is larger than the sum of its proper divisors (8642909).

509928091 is an equidigital number, since it uses as much as digits as its factorization.

509928091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8642908.

The product of its (nonzero) digits is 58320, while the sum is 43.

The square root of 509928091 is about 22581.5874331279. The cubic root of 509928091 is about 798.9194218248.

The spelling of 509928091 in words is "five hundred nine million, nine hundred twenty-eight thousand, ninety-one".