765040091 has 2 divisors, whose sum is σ = 765040092. Its totient is φ = 765040090.

The previous prime is 765040063. The next prime is 765040117. The reversal of 765040091 is 190040567.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 765040091 - 2⁶ = 765040027 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (765040021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382520045 + 382520046.

It is an arithmetic number, because the mean of its divisors is an integer number (382520046).

Almost surely, 2^765040091 is an apocalyptic number.

765040091 is a deficient number, since it is larger than the sum of its proper divisors (1).

765040091 is an equidigital number, since it uses as much as digits as its factorization.

765040091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 765040091 is about 27659.3581089656. The cubic root of 765040091 is about 914.5934037096.

The spelling of 765040091 in words is "seven hundred sixty-five million, forty thousand, ninety-one".