165115309 has 2 divisors, whose sum is σ = 165115310. Its totient is φ = 165115308.

The previous prime is 165115297. The next prime is 165115333. The reversal of 165115309 is 903511561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 128754409 + 36360900 = 11347^2 + 6030^2 .

It is a cyclic number.

It is not a de Polignac number, because 165115309 - 2¹¹ = 165113261 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 (165115369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82557654 + 82557655.

It is an arithmetic number, because the mean of its divisors is an integer number (82557655).

Almost surely, 2^165115309 is an apocalyptic number.

It is an amenable number.

165115309 is a deficient number, since it is larger than the sum of its proper divisors (1).

165115309 is an equidigital number, since it uses as much as digits as its factorization.

165115309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050, while the sum is 31.

The square root of 165115309 is about 12849.7201915061. The cubic root of 165115309 is about 548.6083926754.

The spelling of 165115309 in words is "one hundred sixty-five million, one hundred fifteen thousand, three hundred nine".