161442193 has 6 divisors (see below), whose sum is σ = 177453122. Its totient is φ = 146765520.

The previous prime is 161442191. The next prime is 161442247. The reversal of 161442193 is 391244161.

It can be written as a sum of positive squares in only one way, i.e., 133911184 + 27531009 = 11572^2 + 5247^2 .

It is not a de Polignac number, because 161442193 - 2¹ = 161442191 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161442191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 666996 + ... + 667237.

Almost surely, 2^161442193 is an apocalyptic number.

It is an amenable number.

161442193 is a deficient number, since it is larger than the sum of its proper divisors (16010929).

161442193 is a wasteful number, since it uses less digits than its factorization.

161442193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1334255 (or 1334244 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 161442193 is about 12705.9904375849. The cubic root of 161442193 is about 544.5097777382.

The spelling of 161442193 in words is "one hundred sixty-one million, four hundred forty-two thousand, one hundred ninety-three".