161544443 has 4 divisors (see below), whose sum is σ = 161573688. Its totient is φ = 161515200.

The previous prime is 161544407. The next prime is 161544451. The reversal of 161544443 is 344445161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161544443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161544463) 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, 3533 + ... + 18318.

It is an arithmetic number, because the mean of its divisors is an integer number (40393422).

Almost surely, 2^161544443 is an apocalyptic number.

161544443 is a deficient number, since it is larger than the sum of its proper divisors (29245).

161544443 is an equidigital number, since it uses as much as digits as its factorization.

161544443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29244.

The product of its digits is 23040, while the sum is 32.

The square root of 161544443 is about 12710.0134933052. The cubic root of 161544443 is about 544.6247092268.

The spelling of 161544443 in words is "one hundred sixty-one million, five hundred forty-four thousand, four hundred forty-three".