164449189 has 2 divisors, whose sum is σ = 164449190. Its totient is φ = 164449188.

The previous prime is 164449171. The next prime is 164449213. The reversal of 164449189 is 981944461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87272964 + 77176225 = 9342^2 + 8785^2 .

It is an emirp because it is prime and its reverse (981944461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164449189 - 2⁹ = 164448677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164449489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82224594 + 82224595.

It is an arithmetic number, because the mean of its divisors is an integer number (82224595).

Almost surely, 2^164449189 is an apocalyptic number.

It is an amenable number.

164449189 is a deficient number, since it is larger than the sum of its proper divisors (1).

164449189 is an equidigital number, since it uses as much as digits as its factorization.

164449189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 248832, while the sum is 46.

The square root of 164449189 is about 12823.7743663868. The cubic root of 164449189 is about 547.8696532738.

The spelling of 164449189 in words is "one hundred sixty-four million, four hundred forty-nine thousand, one hundred eighty-nine".