164649109 has 2 divisors, whose sum is σ = 164649110. Its totient is φ = 164649108.

The previous prime is 164649073. The next prime is 164649113. The reversal of 164649109 is 901946461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 142134084 + 22515025 = 11922^2 + 4745^2 .

It is a cyclic number.

It is not a de Polignac number, because 164649109 - 2⁹ = 164648597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164649119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82324554 + 82324555.

It is an arithmetic number, because the mean of its divisors is an integer number (82324555).

Almost surely, 2^164649109 is an apocalyptic number.

It is an amenable number.

164649109 is a deficient number, since it is larger than the sum of its proper divisors (1).

164649109 is an equidigital number, since it uses as much as digits as its factorization.

164649109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 164649109 is about 12831.5668957458. The cubic root of 164649109 is about 548.0915774370.

The spelling of 164649109 in words is "one hundred sixty-four million, six hundred forty-nine thousand, one hundred nine".