864626489 has 2 divisors, whose sum is σ = 864626490. Its totient is φ = 864626488.

The previous prime is 864626479. The next prime is 864626501. The reversal of 864626489 is 984626468.

864626489 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., 725386489 + 139240000 = 26933^2 + 11800^2 .

It is a cyclic number.

It is not a de Polignac number, because 864626489 - 2²⁸ = 596191033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 864626489.

It is not a weakly prime, because it can be changed into another prime (864626459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432313244 + 432313245.

It is an arithmetic number, because the mean of its divisors is an integer number (432313245).

Almost surely, 2^864626489 is an apocalyptic number.

It is an amenable number.

864626489 is a deficient number, since it is larger than the sum of its proper divisors (1).

864626489 is an equidigital number, since it uses as much as digits as its factorization.

864626489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 53.

The square root of 864626489 is about 29404.5317765816. The cubic root of 864626489 is about 952.6707814183.

The spelling of 864626489 in words is "eight hundred sixty-four million, six hundred twenty-six thousand, four hundred eighty-nine".