164020309 has 2 divisors, whose sum is σ = 164020310. Its totient is φ = 164020308.

The previous prime is 164020273. The next prime is 164020313. The reversal of 164020309 is 903020461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157502500 + 6517809 = 12550^2 + 2553^2 .

It is a cyclic number.

It is not a de Polignac number, because 164020309 - 2¹⁵ = 163987541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164020379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82010154 + 82010155.

It is an arithmetic number, because the mean of its divisors is an integer number (82010155).

Almost surely, 2^164020309 is an apocalyptic number.

It is an amenable number.

164020309 is a deficient number, since it is larger than the sum of its proper divisors (1).

164020309 is an equidigital number, since it uses as much as digits as its factorization.

164020309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 164020309 is about 12807.0413835515. The cubic root of 164020309 is about 547.3929611505.

The spelling of 164020309 in words is "one hundred sixty-four million, twenty thousand, three hundred nine".