164157709 has 2 divisors, whose sum is σ = 164157710. Its totient is φ = 164157708.

The previous prime is 164157691. The next prime is 164157713. The reversal of 164157709 is 907751461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97081609 + 67076100 = 9853^2 + 8190^2 .

It is an emirp because it is prime and its reverse (907751461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164157709 - 2¹¹ = 164155661 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 (164157209) 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, 82078854 + 82078855.

It is an arithmetic number, because the mean of its divisors is an integer number (82078855).

Almost surely, 2^164157709 is an apocalyptic number.

It is an amenable number.

164157709 is a deficient number, since it is larger than the sum of its proper divisors (1).

164157709 is an equidigital number, since it uses as much as digits as its factorization.

164157709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52920, while the sum is 40.

The square root of 164157709 is about 12812.4044972050. The cubic root of 164157709 is about 547.5457690587.

The spelling of 164157709 in words is "one hundred sixty-four million, one hundred fifty-seven thousand, seven hundred nine".