161992443 has 8 divisors (see below), whose sum is σ = 217366288. Its totient is φ = 107306784.

The previous prime is 161992429. The next prime is 161992447. The reversal of 161992443 is 344299161.

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

It is not a de Polignac number, because 161992443 - 2⁶ = 161992379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161992447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171496 + ... + 172437.

It is an arithmetic number, because the mean of its divisors is an integer number (27170786).

Almost surely, 2^161992443 is an apocalyptic number.

161992443 is a deficient number, since it is larger than the sum of its proper divisors (55373845).

161992443 is a wasteful number, since it uses less digits than its factorization.

161992443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344093.

The product of its digits is 46656, while the sum is 39.

The square root of 161992443 is about 12727.6251908987. The cubic root of 161992443 is about 545.1277011868.

The spelling of 161992443 in words is "one hundred sixty-one million, nine hundred ninety-two thousand, four hundred forty-three".