765215897 has 2 divisors, whose sum is σ = 765215898. Its totient is φ = 765215896.

The previous prime is 765215887. The next prime is 765215909. The reversal of 765215897 is 798512567.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 739622416 + 25593481 = 27196^2 + 5059^2 .

It is an emirp because it is prime and its reverse (798512567) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 765215897 - 2¹⁸ = 764953753 is a prime.

It is not a weakly prime, because it can be changed into another prime (765215807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382607948 + 382607949.

It is an arithmetic number, because the mean of its divisors is an integer number (382607949).

Almost surely, 2^765215897 is an apocalyptic number.

It is an amenable number.

765215897 is a deficient number, since it is larger than the sum of its proper divisors (1).

765215897 is an equidigital number, since it uses as much as digits as its factorization.

765215897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 50.

The square root of 765215897 is about 27662.5359828053. The cubic root of 765215897 is about 914.6634561138.

The spelling of 765215897 in words is "seven hundred sixty-five million, two hundred fifteen thousand, eight hundred ninety-seven".