161730173 has 6 divisors (see below), whose sum is σ = 177769662. Its totient is φ = 147027320.

The previous prime is 161730139. The next prime is 161730203. The reversal of 161730173 is 371037161.

It can be written as a sum of positive squares in only one way, i.e., 80964004 + 80766169 = 8998^2 + 8987^2 .

It is not a de Polignac number, because 161730173 - 2²⁰ = 160681597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161730133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 668186 + ... + 668427.

It is an arithmetic number, because the mean of its divisors is an integer number (29628277).

Almost surely, 2^161730173 is an apocalyptic number.

It is an amenable number.

161730173 is a deficient number, since it is larger than the sum of its proper divisors (16039489).

161730173 is a wasteful number, since it uses less digits than its factorization.

161730173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336635 (or 1336624 counting only the distinct ones).

The product of its (nonzero) digits is 2646, while the sum is 29.

The square root of 161730173 is about 12717.3178382865. The cubic root of 161730173 is about 544.8333502760.

The spelling of 161730173 in words is "one hundred sixty-one million, seven hundred thirty thousand, one hundred seventy-three".