509720929 has 9 divisors (see below), whose sum is σ = 516979281. Its totient is φ = 502564020.

The previous prime is 509720927. The next prime is 509720947. The reversal of 509720929 is 929027905.

The square root of 509720929 is 22577.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 509720929 - 2¹ = 509720927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509720927) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2415634 + ... + 2415844.

Almost surely, 2^509720929 is an apocalyptic number.

509720929 is the 22577-th square number.

509720929 is the 11289-th centered octagonal number.

It is an amenable number.

509720929 is a deficient number, since it is larger than the sum of its proper divisors (7258352).

509720929 is an frugal number, since it uses more digits than its factorization.

509720929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 102060, while the sum is 43.

The cubic root of 509720929 is about 798.8112182265.

The spelling of 509720929 in words is "five hundred nine million, seven hundred twenty thousand, nine hundred twenty-nine".