164243689 has 2 divisors, whose sum is σ = 164243690. Its totient is φ = 164243688.

The previous prime is 164243633. The next prime is 164243701. The reversal of 164243689 is 986342461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101707225 + 62536464 = 10085^2 + 7908^2 .

It is a cyclic number.

It is not a de Polignac number, because 164243689 - 2²⁵ = 130689257 is a prime.

It is not a weakly prime, because it can be changed into another prime (164273689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82121844 + 82121845.

It is an arithmetic number, because the mean of its divisors is an integer number (82121845).

Almost surely, 2^164243689 is an apocalyptic number.

It is an amenable number.

164243689 is a deficient number, since it is larger than the sum of its proper divisors (1).

164243689 is an equidigital number, since it uses as much as digits as its factorization.

164243689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 43.

The square root of 164243689 is about 12815.7594000512. The cubic root of 164243689 is about 547.6413474076.

The spelling of 164243689 in words is "one hundred sixty-four million, two hundred forty-three thousand, six hundred eighty-nine".