164840309 has 2 divisors, whose sum is σ = 164840310. Its totient is φ = 164840308.

The previous prime is 164840267. The next prime is 164840311. The reversal of 164840309 is 903048461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82992100 + 81848209 = 9110^2 + 9047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164840309 is a prime.

Together with 164840311, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164840359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82420154 + 82420155.

It is an arithmetic number, because the mean of its divisors is an integer number (82420155).

Almost surely, 2^164840309 is an apocalyptic number.

It is an amenable number.

164840309 is a deficient number, since it is larger than the sum of its proper divisors (1).

164840309 is an equidigital number, since it uses as much as digits as its factorization.

164840309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 164840309 is about 12839.0151102022. The cubic root of 164840309 is about 548.3036538373.

The spelling of 164840309 in words is "one hundred sixty-four million, eight hundred forty thousand, three hundred nine".