509252309 has 4 divisors (see below), whose sum is σ = 511891116. Its totient is φ = 506613504.

The previous prime is 509252299. The next prime is 509252329. The reversal of 509252309 is 903252905.

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 44849809 + 464402500 = 6697^2 + 21550^2 .

It is a cyclic number.

It is not a de Polignac number, because 509252309 - 2¹² = 509248213 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509252329) 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, 1319114 + ... + 1319499.

It is an arithmetic number, because the mean of its divisors is an integer number (127972779).

Almost surely, 2^509252309 is an apocalyptic number.

It is an amenable number.

509252309 is a deficient number, since it is larger than the sum of its proper divisors (2638807).

509252309 is a wasteful number, since it uses less digits than its factorization.

509252309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2638806.

The product of its (nonzero) digits is 24300, while the sum is 35.

The square root of 509252309 is about 22566.6193524861. The cubic root of 509252309 is about 798.5663432577.

The spelling of 509252309 in words is "five hundred nine million, two hundred fifty-two thousand, three hundred nine".