320517409 has 3 divisors (see below), whose sum is σ = 320535313. Its totient is φ = 320499506.

The previous prime is 320517389. The next prime is 320517413. The reversal of 320517409 is 904715023.

The square root of 320517409 is 17903.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-320517409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320517469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8952 + ... + 26854.

Almost surely, 2^320517409 is an apocalyptic number.

320517409 is the 17903-rd square number.

320517409 is the 8952-nd centered octagonal number.

It is an amenable number.

320517409 is a deficient number, since it is larger than the sum of its proper divisors (17904).

320517409 is an frugal number, since it uses more digits than its factorization.

320517409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35806 (or 17903 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The cubic root of 320517409 is about 684.3588288861.

The spelling of 320517409 in words is "three hundred twenty million, five hundred seventeen thousand, four hundred nine".