165308389 has 2 divisors, whose sum is σ = 165308390. Its totient is φ = 165308388.

The previous prime is 165308329. The next prime is 165308401. The reversal of 165308389 is 983803561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113252164 + 52056225 = 10642^2 + 7215^2 .

It is a cyclic number.

It is not a de Polignac number, because 165308389 - 2⁷ = 165308261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165308309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82654194 + 82654195.

It is an arithmetic number, because the mean of its divisors is an integer number (82654195).

Almost surely, 2^165308389 is an apocalyptic number.

It is an amenable number.

165308389 is a deficient number, since it is larger than the sum of its proper divisors (1).

165308389 is an equidigital number, since it uses as much as digits as its factorization.

165308389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 165308389 is about 12857.2310004915. The cubic root of 165308389 is about 548.8221504576.

The spelling of 165308389 in words is "one hundred sixty-five million, three hundred eight thousand, three hundred eighty-nine".