161822 has 4 divisors (see below), whose sum is σ = 242736. Its totient is φ = 80910.

The previous prime is 161807. The next prime is 161831. The reversal of 161822 is 228161.

161822 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 228161 = 151 ⋅1511.

It is a junction number, because it is equal to n+sod(n) for n = 161794 and 161803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40454 + ... + 40457.

It is an arithmetic number, because the mean of its divisors is an integer number (60684).

2¹⁶¹⁸²² is an apocalyptic number.

161822 is a deficient number, since it is larger than the sum of its proper divisors (80914).

161822 is an equidigital number, since it uses as much as digits as its factorization.

161822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80913.

The product of its digits is 192, while the sum is 20.

The square root of 161822 is about 402.2710528984. The cubic root of 161822 is about 54.4936445750.

Adding to 161822 its reverse (228161), we get a palindrome (389983).

The spelling of 161822 in words is "one hundred sixty-one thousand, eight hundred twenty-two".