868724189 has 2 divisors, whose sum is σ = 868724190. Its totient is φ = 868724188.

The previous prime is 868724179. The next prime is 868724239. The reversal of 868724189 is 981427868.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 832784164 + 35940025 = 28858^2 + 5995^2 .

It is a cyclic number.

It is not a de Polignac number, because 868724189 - 2²⁴ = 851946973 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 868724189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (868724149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434362094 + 434362095.

It is an arithmetic number, because the mean of its divisors is an integer number (434362095).

Almost surely, 2^868724189 is an apocalyptic number.

It is an amenable number.

868724189 is a deficient number, since it is larger than the sum of its proper divisors (1).

868724189 is an equidigital number, since it uses as much as digits as its factorization.

868724189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1548288, while the sum is 53.

The square root of 868724189 is about 29474.1274510375. The cubic root of 868724189 is about 954.1733987545.

The spelling of 868724189 in words is "eight hundred sixty-eight million, seven hundred twenty-four thousand, one hundred eighty-nine".