164839709 has 2 divisors, whose sum is σ = 164839710. Its totient is φ = 164839708.

The previous prime is 164839681. The next prime is 164839723. The reversal of 164839709 is 907938461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113316025 + 51523684 = 10645^2 + 7178^2 .

It is an emirp because it is prime and its reverse (907938461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164839709 is a 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 (164839729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82419854 + 82419855.

It is an arithmetic number, because the mean of its divisors is an integer number (82419855).

Almost surely, 2^164839709 is an apocalyptic number.

It is an amenable number.

164839709 is a deficient number, since it is larger than the sum of its proper divisors (1).

164839709 is an equidigital number, since it uses as much as digits as its factorization.

164839709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 164839709 is about 12838.9917439026. The cubic root of 164839709 is about 548.3029885822.

The spelling of 164839709 in words is "one hundred sixty-four million, eight hundred thirty-nine thousand, seven hundred nine".