81822122 has 16 divisors (see below), whose sum is σ = 130176072. Its totient is φ = 38438400.

The previous prime is 81822073. The next prime is 81822127. The reversal of 81822122 is 22122818.

It can be written as a sum of positive squares in 4 ways, for example, as 80478841 + 1343281 = 8971^2 + 1159^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81822091 and 81822100.

It is not an unprimeable number, because it can be changed into a prime (81822127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22118 + ... + 25550.

Almost surely, 2^81822122 is an apocalyptic number.

81822122 is a deficient number, since it is larger than the sum of its proper divisors (48353950).

81822122 is a wasteful number, since it uses less digits than its factorization.

81822122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4153.

The product of its digits is 1024, while the sum is 26.

The square root of 81822122 is about 9045.5581364557. The cubic root of 81822122 is about 434.1337798206.

The spelling of 81822122 in words is "eighty-one million, eight hundred twenty-two thousand, one hundred twenty-two".