164343191 has 2 divisors, whose sum is σ = 164343192. Its totient is φ = 164343190.

The previous prime is 164343187. The next prime is 164343209. The reversal of 164343191 is 191343461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 164343191 - 2² = 164343187 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164343181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82171595 + 82171596.

It is an arithmetic number, because the mean of its divisors is an integer number (82171596).

Almost surely, 2^164343191 is an apocalyptic number.

164343191 is a deficient number, since it is larger than the sum of its proper divisors (1).

164343191 is an equidigital number, since it uses as much as digits as its factorization.

164343191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7776, while the sum is 32.

The square root of 164343191 is about 12819.6408296021. The cubic root of 164343191 is about 547.7519156520.

The spelling of 164343191 in words is "one hundred sixty-four million, three hundred forty-three thousand, one hundred ninety-one".