161810873 has 8 divisors (see below), whose sum is σ = 186258240. Its totient is φ = 137696400.

The previous prime is 161810861. The next prime is 161810893. The reversal of 161810873 is 378018161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161810873 - 2²⁴ = 145033657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161810813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82178 + ... + 84123.

It is an arithmetic number, because the mean of its divisors is an integer number (23282280).

Almost surely, 2^161810873 is an apocalyptic number.

It is an amenable number.

161810873 is a deficient number, since it is larger than the sum of its proper divisors (24447367).

161810873 is a wasteful number, since it uses less digits than its factorization.

161810873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166447.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 161810873 is about 12720.4902814318. The cubic root of 161810873 is about 544.9239553860.

The spelling of 161810873 in words is "one hundred sixty-one million, eight hundred ten thousand, eight hundred seventy-three".