869189609 has 2 divisors, whose sum is σ = 869189610. Its totient is φ = 869189608.

The previous prime is 869189579. The next prime is 869189663. The reversal of 869189609 is 906981968.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 518563984 + 350625625 = 22772^2 + 18725^2 .

It is a cyclic number.

It is not a de Polignac number, because 869189609 - 2⁸ = 869189353 is a prime.

It is not a weakly prime, because it can be changed into another prime (869189809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434594804 + 434594805.

It is an arithmetic number, because the mean of its divisors is an integer number (434594805).

Almost surely, 2^869189609 is an apocalyptic number.

It is an amenable number.

869189609 is a deficient number, since it is larger than the sum of its proper divisors (1).

869189609 is an equidigital number, since it uses as much as digits as its factorization.

869189609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 56.

The square root of 869189609 is about 29482.0217929504. The cubic root of 869189609 is about 954.3437681710.

The spelling of 869189609 in words is "eight hundred sixty-nine million, one hundred eighty-nine thousand, six hundred nine".