865676869 has 2 divisors, whose sum is σ = 865676870. Its totient is φ = 865676868.

The previous prime is 865676821. The next prime is 865676887. The reversal of 865676869 is 968676568.

865676869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 833072769 + 32604100 = 28863^2 + 5710^2 .

It is a cyclic number.

It is not a de Polignac number, because 865676869 - 2⁷ = 865676741 is a prime.

It is a super-2 number, since 2×865676869² = 1498792883043286322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (865673869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432838434 + 432838435.

It is an arithmetic number, because the mean of its divisors is an integer number (432838435).

Almost surely, 2^865676869 is an apocalyptic number.

It is an amenable number.

865676869 is a deficient number, since it is larger than the sum of its proper divisors (1).

865676869 is an equidigital number, since it uses as much as digits as its factorization.

865676869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26127360, while the sum is 61.

The square root of 865676869 is about 29422.3872077029. The cubic root of 865676869 is about 953.0564051167.

The spelling of 865676869 in words is "eight hundred sixty-five million, six hundred seventy-six thousand, eight hundred sixty-nine".