865215763 has 2 divisors, whose sum is σ = 865215764. Its totient is φ = 865215762.

The previous prime is 865215737. The next prime is 865215773. The reversal of 865215763 is 367512568.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 865215763 - 2¹⁷ = 865084691 is a prime.

It is not a weakly prime, because it can be changed into another prime (865215713) 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, 432607881 + 432607882.

It is an arithmetic number, because the mean of its divisors is an integer number (432607882).

Almost surely, 2^865215763 is an apocalyptic number.

865215763 is a deficient number, since it is larger than the sum of its proper divisors (1).

865215763 is an equidigital number, since it uses as much as digits as its factorization.

865215763 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 43.

The square root of 865215763 is about 29414.5501920393. The cubic root of 865215763 is about 952.8871587184.

The spelling of 865215763 in words is "eight hundred sixty-five million, two hundred fifteen thousand, seven hundred sixty-three".