161234309 has 2 divisors, whose sum is σ = 161234310. Its totient is φ = 161234308.

The previous prime is 161234303. The next prime is 161234329. The reversal of 161234309 is 903432161.

161234309 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., 124389409 + 36844900 = 11153^2 + 6070^2 .

It is an emirp because it is prime and its reverse (903432161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161234309 - 2⁸ = 161234053 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161234303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80617154 + 80617155.

It is an arithmetic number, because the mean of its divisors is an integer number (80617155).

Almost surely, 2^161234309 is an apocalyptic number.

It is an amenable number.

161234309 is a deficient number, since it is larger than the sum of its proper divisors (1).

161234309 is an equidigital number, since it uses as much as digits as its factorization.

161234309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 161234309 is about 12697.8072516478. The cubic root of 161234309 is about 544.2759613504.

The spelling of 161234309 in words is "one hundred sixty-one million, two hundred thirty-four thousand, three hundred nine".