164743109 has 4 divisors (see below), whose sum is σ = 165021516. Its totient is φ = 164464704.

The previous prime is 164743099. The next prime is 164743121. The reversal of 164743109 is 901347461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 901347461 = 7 ⋅128763923.

It can be written as a sum of positive squares in 2 ways, for example, as 130462084 + 34281025 = 11422^2 + 5855^2 .

It is a cyclic number.

It is not a de Polignac number, because 164743109 - 2⁴ = 164743093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164743009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138314 + ... + 139499.

It is an arithmetic number, because the mean of its divisors is an integer number (41255379).

Almost surely, 2^164743109 is an apocalyptic number.

It is an amenable number.

164743109 is a deficient number, since it is larger than the sum of its proper divisors (278407).

164743109 is an equidigital number, since it uses as much as digits as its factorization.

164743109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278406.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 164743109 is about 12835.2292149381. The cubic root of 164743109 is about 548.1958614447.

The spelling of 164743109 in words is "one hundred sixty-four million, seven hundred forty-three thousand, one hundred nine".