765510997 has 2 divisors, whose sum is σ = 765510998. Its totient is φ = 765510996.

The previous prime is 765510961. The next prime is 765511049. The reversal of 765510997 is 799015567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 735982641 + 29528356 = 27129^2 + 5434^2 .

It is a cyclic number.

It is not a de Polignac number, because 765510997 - 2¹⁹ = 764986709 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 765510997.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (765510397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382755498 + 382755499.

It is an arithmetic number, because the mean of its divisors is an integer number (382755499).

Almost surely, 2^765510997 is an apocalyptic number.

It is an amenable number.

765510997 is a deficient number, since it is larger than the sum of its proper divisors (1).

765510997 is an equidigital number, since it uses as much as digits as its factorization.

765510997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 595350, while the sum is 49.

The square root of 765510997 is about 27667.8693975521. The cubic root of 765510997 is about 914.7810187943.

The spelling of 765510997 in words is "seven hundred sixty-five million, five hundred ten thousand, nine hundred ninety-seven".