765806081 has 2 divisors, whose sum is σ = 765806082. Its totient is φ = 765806080.

The previous prime is 765806053. The next prime is 765806099. The reversal of 765806081 is 180608567.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706762225 + 59043856 = 26585^2 + 7684^2 .

It is a cyclic number.

It is not a de Polignac number, because 765806081 - 2²⁶ = 698697217 is a prime.

It is a super-2 number, since 2×765806081² = 1172917907393157122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (765806011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382903040 + 382903041.

It is an arithmetic number, because the mean of its divisors is an integer number (382903041).

Almost surely, 2^765806081 is an apocalyptic number.

It is an amenable number.

765806081 is a deficient number, since it is larger than the sum of its proper divisors (1).

765806081 is an equidigital number, since it uses as much as digits as its factorization.

765806081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 765806081 is about 27673.2014953095. The cubic root of 765806081 is about 914.8985448939.

The spelling of 765806081 in words is "seven hundred sixty-five million, eight hundred six thousand, eighty-one".