864188069 has 2 divisors, whose sum is σ = 864188070. Its totient is φ = 864188068.

The previous prime is 864188057. The next prime is 864188099. The reversal of 864188069 is 960881468.

It is a happy number.

864188069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 861422500 + 2765569 = 29350^2 + 1663^2 .

It is a cyclic number.

It is not a de Polignac number, because 864188069 - 2⁴ = 864188053 is a prime.

It is a super-2 number, since 2×864188069² = 1493642037203897522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864188099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432094034 + 432094035.

It is an arithmetic number, because the mean of its divisors is an integer number (432094035).

Almost surely, 2^864188069 is an apocalyptic number.

It is an amenable number.

864188069 is a deficient number, since it is larger than the sum of its proper divisors (1).

864188069 is an equidigital number, since it uses as much as digits as its factorization.

864188069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 663552, while the sum is 50.

The square root of 864188069 is about 29397.0758579829. The cubic root of 864188069 is about 952.5097328637.

The spelling of 864188069 in words is "eight hundred sixty-four million, one hundred eighty-eight thousand, sixty-nine".