81822219 has 8 divisors (see below), whose sum is σ = 109819392. Its totient is φ = 54186600.

The previous prime is 81822187. The next prime is 81822271. The reversal of 81822219 is 91222818.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81822219 - 2⁵ = 81822187 is a prime.

It is a super-2 number, since 2×81822219² = 13389751044167922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81822219.

It is not an unprimeable number, because it can be changed into a prime (81892219) 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, 89859 + ... + 90764.

It is an arithmetic number, because the mean of its divisors is an integer number (13727424).

Almost surely, 2^81822219 is an apocalyptic number.

81822219 is a deficient number, since it is larger than the sum of its proper divisors (27997173).

81822219 is a wasteful number, since it uses less digits than its factorization.

81822219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180777.

The product of its digits is 4608, while the sum is 33.

The square root of 81822219 is about 9045.5634982018. The cubic root of 81822219 is about 434.1339513755.

It can be divided in two parts, 8182 and 2219, that added together give a palindrome (10401).

The spelling of 81822219 in words is "eighty-one million, eight hundred twenty-two thousand, two hundred nineteen".