161442443 has 4 divisors (see below), whose sum is σ = 161473008. Its totient is φ = 161411880.

The previous prime is 161442439. The next prime is 161442499. The reversal of 161442443 is 344244161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344244161 = 17107 ⋅20123.

It is a cyclic number.

It is not a de Polignac number, because 161442443 - 2² = 161442439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161442343) 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, 5096 + ... + 18677.

It is an arithmetic number, because the mean of its divisors is an integer number (40368252).

Almost surely, 2^161442443 is an apocalyptic number.

161442443 is a deficient number, since it is larger than the sum of its proper divisors (30565).

161442443 is an equidigital number, since it uses as much as digits as its factorization.

161442443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30564.

The product of its digits is 9216, while the sum is 29.

The square root of 161442443 is about 12706.0002754604. Note that the first 3 decimals coincide. The cubic root of 161442443 is about 544.5100588035.

The spelling of 161442443 in words is "one hundred sixty-one million, four hundred forty-two thousand, four hundred forty-three".