161801443 has 2 divisors, whose sum is σ = 161801444. Its totient is φ = 161801442.

The previous prime is 161801413. The next prime is 161801447. The reversal of 161801443 is 344108161.

161801443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (344108161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161801443 - 2¹⁷ = 161670371 is a prime.

It is not a weakly prime, because it can be changed into another prime (161801447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80900721 + 80900722.

It is an arithmetic number, because the mean of its divisors is an integer number (80900722).

Almost surely, 2^161801443 is an apocalyptic number.

161801443 is a deficient number, since it is larger than the sum of its proper divisors (1).

161801443 is an equidigital number, since it uses as much as digits as its factorization.

161801443 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 161801443 is about 12720.1196142175. The cubic root of 161801443 is about 544.9133695034.

The spelling of 161801443 in words is "one hundred sixty-one million, eight hundred one thousand, four hundred forty-three".