513787609 has 4 divisors (see below), whose sum is σ = 518334516. Its totient is φ = 509240704.

The previous prime is 513787543. The next prime is 513787613. The reversal of 513787609 is 906787315.

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 282139209 + 231648400 = 16797^2 + 15220^2 .

It is a cyclic number.

It is not a de Polignac number, because 513787609 - 2¹³ = 513779417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (513787619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2273284 + ... + 2273509.

It is an arithmetic number, because the mean of its divisors is an integer number (129583629).

Almost surely, 2^513787609 is an apocalyptic number.

It is an amenable number.

513787609 is a deficient number, since it is larger than the sum of its proper divisors (4546907).

513787609 is a wasteful number, since it uses less digits than its factorization.

513787609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4546906.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 513787609 is about 22666.8835308253. The cubic root of 513787609 is about 800.9299648919.

The spelling of 513787609 in words is "five hundred thirteen million, seven hundred eighty-seven thousand, six hundred nine".