509989797 has 16 divisors (see below), whose sum is σ = 769798080. Its totient is φ = 333577296.

The previous prime is 509989789. The next prime is 509989813. The reversal of 509989797 is 797989905.

It is not a de Polignac number, because 509989797 - 2³ = 509989789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509939797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176763 + ... + 179624.

It is an arithmetic number, because the mean of its divisors is an integer number (48112380).

Almost surely, 2^509989797 is an apocalyptic number.

It is an amenable number.

509989797 is a deficient number, since it is larger than the sum of its proper divisors (259808283).

509989797 is a wasteful number, since it uses less digits than its factorization.

509989797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356449 (or 356443 counting only the distinct ones).

The product of its (nonzero) digits is 12859560, while the sum is 63.

The square root of 509989797 is about 22582.9536819257. The cubic root of 509989797 is about 798.9516460635.

The spelling of 509989797 in words is "five hundred nine million, nine hundred eighty-nine thousand, seven hundred ninety-seven".