765538913 has 2 divisors, whose sum is σ = 765538914. Its totient is φ = 765538912.

The previous prime is 765538909. The next prime is 765538927. The reversal of 765538913 is 319835567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 702939169 + 62599744 = 26513^2 + 7912^2 .

It is a cyclic number.

It is not a de Polignac number, because 765538913 - 2² = 765538909 is a prime.

It is not a weakly prime, because it can be changed into another prime (765538903) 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 as a sum of consecutive naturals, namely, 382769456 + 382769457.

It is an arithmetic number, because the mean of its divisors is an integer number (382769457).

Almost surely, 2^765538913 is an apocalyptic number.

It is an amenable number.

765538913 is a deficient number, since it is larger than the sum of its proper divisors (1).

765538913 is an equidigital number, since it uses as much as digits as its factorization.

765538913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 680400, while the sum is 47.

The square root of 765538913 is about 27668.3738770460. The cubic root of 765538913 is about 914.7921384763.

The spelling of 765538913 in words is "seven hundred sixty-five million, five hundred thirty-eight thousand, nine hundred thirteen".