164401189 has 2 divisors, whose sum is σ = 164401190. Its totient is φ = 164401188.

The previous prime is 164401187. The next prime is 164401213. The reversal of 164401189 is 981104461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 98109025 + 66292164 = 9905^2 + 8142^2 .

It is a cyclic number.

It is not a de Polignac number, because 164401189 - 2¹ = 164401187 is a prime.

It is a super-3 number, since 3×164401189³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 164401187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164401187) 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, 82200594 + 82200595.

It is an arithmetic number, because the mean of its divisors is an integer number (82200595).

Almost surely, 2^164401189 is an apocalyptic number.

It is an amenable number.

164401189 is a deficient number, since it is larger than the sum of its proper divisors (1).

164401189 is an equidigital number, since it uses as much as digits as its factorization.

164401189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 164401189 is about 12821.9027059169. The cubic root of 164401189 is about 547.8163433881.

The spelling of 164401189 in words is "one hundred sixty-four million, four hundred one thousand, one hundred eighty-nine".