81814822 has 8 divisors (see below), whose sum is σ = 122787000. Its totient is φ = 40885824.

The previous prime is 81814801. The next prime is 81814867. The reversal of 81814822 is 22841818.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5547 + ... + 13942.

It is an arithmetic number, because the mean of its divisors is an integer number (15348375).

Almost surely, 2^81814822 is an apocalyptic number.

81814822 is a deficient number, since it is larger than the sum of its proper divisors (40972178).

81814822 is a wasteful number, since it uses less digits than its factorization.

81814822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21590.

The product of its digits is 8192, while the sum is 34.

The square root of 81814822 is about 9045.1546144884. The cubic root of 81814822 is about 434.1208685982.

The spelling of 81814822 in words is "eighty-one million, eight hundred fourteen thousand, eight hundred twenty-two".