164720009 has 2 divisors, whose sum is σ = 164720010. Its totient is φ = 164720008.

The previous prime is 164719999. The next prime is 164720027. The reversal of 164720009 is 900027461.

164720009 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108889225 + 55830784 = 10435^2 + 7472^2 .

It is an emirp because it is prime and its reverse (900027461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164720009 - 2¹² = 164715913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (164720099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82360004 + 82360005.

It is an arithmetic number, because the mean of its divisors is an integer number (82360005).

Almost surely, 2^164720009 is an apocalyptic number.

It is an amenable number.

164720009 is a deficient number, since it is larger than the sum of its proper divisors (1).

164720009 is an equidigital number, since it uses as much as digits as its factorization.

164720009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 164720009 is about 12834.3293163297. The cubic root of 164720009 is about 548.1702378816.

The spelling of 164720009 in words is "one hundred sixty-four million, seven hundred twenty thousand, nine".