161924309 has 2 divisors, whose sum is σ = 161924310. Its totient is φ = 161924308.

The previous prime is 161924299. The next prime is 161924333. The reversal of 161924309 is 903429161.

161924309 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., 95452900 + 66471409 = 9770^2 + 8153^2 .

It is an emirp because it is prime and its reverse (903429161) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161924309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161924359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80962154 + 80962155.

It is an arithmetic number, because the mean of its divisors is an integer number (80962155).

Almost surely, 2^161924309 is an apocalyptic number.

It is an amenable number.

161924309 is a deficient number, since it is larger than the sum of its proper divisors (1).

161924309 is an equidigital number, since it uses as much as digits as its factorization.

161924309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 161924309 is about 12724.9482906611. The cubic root of 161924309 is about 545.0512635897.

The spelling of 161924309 in words is "one hundred sixty-one million, nine hundred twenty-four thousand, three hundred nine".