509497889 has 4 divisors (see below), whose sum is σ = 509958420. Its totient is φ = 509037360.

The previous prime is 509497873. The next prime is 509497913. The reversal of 509497889 is 988794905.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 174900625 + 334597264 = 13225^2 + 18292^2 .

It is a cyclic number.

It is not a de Polignac number, because 509497889 - 2⁴ = 509497873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509497829) 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, 228602 + ... + 230819.

It is an arithmetic number, because the mean of its divisors is an integer number (127489605).

Almost surely, 2^509497889 is an apocalyptic number.

It is an amenable number.

509497889 is a deficient number, since it is larger than the sum of its proper divisors (460531).

509497889 is a wasteful number, since it uses less digits than its factorization.

509497889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460530.

The product of its (nonzero) digits is 6531840, while the sum is 59.

The square root of 509497889 is about 22572.0599192896. The cubic root of 509497889 is about 798.6946885484.

The spelling of 509497889 in words is "five hundred nine million, four hundred ninety-seven thousand, eight hundred eighty-nine".