765130921 has 9 divisors (see below), whose sum is σ = 774567261. Its totient is φ = 755809164.

The previous prime is 765130913. The next prime is 765131009. The reversal of 765130921 is 129031567.

The square root of 765130921 is 27661.

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

It is not a de Polignac number, because 765130921 - 2³ = 765130913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765130901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3844780 + ... + 3844978.

It is an arithmetic number, because the mean of its divisors is an integer number (86063029).

Almost surely, 2^765130921 is an apocalyptic number.

765130921 is the 27661-st square number.

765130921 is the 13831-st centered octagonal number.

It is an amenable number.

765130921 is a deficient number, since it is larger than the sum of its proper divisors (9436340).

765130921 is an frugal number, since it uses more digits than its factorization.

765130921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 338 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 34.

The cubic root of 765130921 is about 914.6295975564.

The spelling of 765130921 in words is "seven hundred sixty-five million, one hundred thirty thousand, nine hundred twenty-one".