161500193 has 2 divisors, whose sum is σ = 161500194. Its totient is φ = 161500192.

The previous prime is 161500151. The next prime is 161500223. The reversal of 161500193 is 391005161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104693824 + 56806369 = 10232^2 + 7537^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161500193 is a prime.

It is not a weakly prime, because it can be changed into another prime (161503193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80750096 + 80750097.

It is an arithmetic number, because the mean of its divisors is an integer number (80750097).

Almost surely, 2^161500193 is an apocalyptic number.

It is an amenable number.

161500193 is a deficient number, since it is larger than the sum of its proper divisors (1).

161500193 is an equidigital number, since it uses as much as digits as its factorization.

161500193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 161500193 is about 12708.2726206200. The cubic root of 161500193 is about 544.5749771042.

The spelling of 161500193 in words is "one hundred sixty-one million, five hundred thousand, one hundred ninety-three".