81922 has 4 divisors (see below), whose sum is σ = 122886. Its totient is φ = 40960.

The previous prime is 81919. The next prime is 81929. The reversal of 81922 is 22918.

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

It can be written as a sum of positive squares in only one way, i.e., 53361 + 28561 = 231^2 + 169^2 .

It is a super-2 number, since 2×81922² = 13422428168, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 81893 and 81902.

It is not an unprimeable number, because it can be changed into a prime (81929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (3) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20479 + ... + 20482.

2⁸¹⁹²² is an apocalyptic number.

81922 is a deficient number, since it is larger than the sum of its proper divisors (40964).

81922 is a wasteful number, since it uses less digits than its factorization.

81922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40963.

The product of its digits is 288, while the sum is 22.

The square root of 81922 is about 286.2201949549. The cubic root of 81922 is about 43.4310353024.

It can be divided in two parts, 8192 and 2, that multiplied together give a 14-th power (16384 = 2¹⁴).

The spelling of 81922 in words is "eighty-one thousand, nine hundred twenty-two".