161748973 has 4 divisors (see below), whose sum is σ = 161865180. Its totient is φ = 161632768.

The previous prime is 161748971. The next prime is 161748997. The reversal of 161748973 is 379847161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 379847161 = 373 ⋅1018357.

It can be written as a sum of positive squares in 2 ways, for example, as 5673924 + 156075049 = 2382^2 + 12493^2 .

It is a cyclic number.

It is not a de Polignac number, because 161748973 - 2¹ = 161748971 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 (161748971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55990 + ... + 58807.

It is an arithmetic number, because the mean of its divisors is an integer number (40466295).

Almost surely, 2^161748973 is an apocalyptic number.

It is an amenable number.

161748973 is a deficient number, since it is larger than the sum of its proper divisors (116207).

161748973 is a wasteful number, since it uses less digits than its factorization.

161748973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116206.

The product of its digits is 254016, while the sum is 46.

The square root of 161748973 is about 12718.0569663766. The cubic root of 161748973 is about 544.8544604785.

The spelling of 161748973 in words is "one hundred sixty-one million, seven hundred forty-eight thousand, nine hundred seventy-three".