81198422 has 12 divisors (see below), whose sum is σ = 124450980. Its totient is φ = 39733236.

The previous prime is 81198421. The next prime is 81198427. The reversal of 81198422 is 22489118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81198421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4772 + ... + 13607.

It is an arithmetic number, because the mean of its divisors is an integer number (10370915).

Almost surely, 2^81198422 is an apocalyptic number.

81198422 is a deficient number, since it is larger than the sum of its proper divisors (43252558).

81198422 is a wasteful number, since it uses less digits than its factorization.

81198422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18475 (or 18428 counting only the distinct ones).

The product of its digits is 9216, while the sum is 35.

The square root of 81198422 is about 9011.0167017934. The cubic root of 81198422 is about 433.0278842847.

The spelling of 81198422 in words is "eighty-one million, one hundred ninety-eight thousand, four hundred twenty-two".