84609689 has 2 divisors, whose sum is σ = 84609690. Its totient is φ = 84609688.

The previous prime is 84609683. The next prime is 84609703. The reversal of 84609689 is 98690648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83814025 + 795664 = 9155^2 + 892^2 .

It is a cyclic number.

It is not a de Polignac number, because 84609689 - 2¹⁶ = 84544153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84609683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42304844 + 42304845.

It is an arithmetic number, because the mean of its divisors is an integer number (42304845).

Almost surely, 2^84609689 is an apocalyptic number.

It is an amenable number.

84609689 is a deficient number, since it is larger than the sum of its proper divisors (1).

84609689 is an equidigital number, since it uses as much as digits as its factorization.

84609689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 84609689 is about 9198.3525155323. The cubic root of 84609689 is about 439.0089419328.

The spelling of 84609689 in words is "eighty-four million, six hundred nine thousand, six hundred eighty-nine".