161507329 has 2 divisors, whose sum is σ = 161507330. Its totient is φ = 161507328.

The previous prime is 161507299. The next prime is 161507389. The reversal of 161507329 is 923705161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124880625 + 36626704 = 11175^2 + 6052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161507329 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161507294 and 161507303.

It is not a weakly prime, because it can be changed into another prime (161507389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80753664 + 80753665.

It is an arithmetic number, because the mean of its divisors is an integer number (80753665).

Almost surely, 2^161507329 is an apocalyptic number.

It is an amenable number.

161507329 is a deficient number, since it is larger than the sum of its proper divisors (1).

161507329 is an equidigital number, since it uses as much as digits as its factorization.

161507329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 161507329 is about 12708.5533795157. The cubic root of 161507329 is about 544.5829977959.

The spelling of 161507329 in words is "one hundred sixty-one million, five hundred seven thousand, three hundred twenty-nine".