331130809 has 9 divisors (see below), whose sum is σ = 342740901. Its totient is φ = 319903260.

The previous prime is 331130759. The next prime is 331130869. The reversal of 331130809 is 908031133.

The square root of 331130809 is 18197.

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

331130809 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 331130809 - 2²⁷ = 196913081 is a prime.

It is a super-2 number, since 2×331130809² = 219295225337988962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331130869) 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, 563814 + ... + 564400.

Almost surely, 2^331130809 is an apocalyptic number.

331130809 is the 18197-th square number.

331130809 is the 9099-th centered octagonal number.

It is an amenable number.

331130809 is a deficient number, since it is larger than the sum of its proper divisors (11610092).

331130809 is an frugal number, since it uses more digits than its factorization.

331130809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 28.

The cubic root of 331130809 is about 691.8307532960.

The spelling of 331130809 in words is "three hundred thirty-one million, one hundred thirty thousand, eight hundred nine".