81244222 has 4 divisors (see below), whose sum is σ = 121866336. Its totient is φ = 40622110.

The previous prime is 81244201. The next prime is 81244259. The reversal of 81244222 is 22244218.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20311054 + ... + 20311057.

It is an arithmetic number, because the mean of its divisors is an integer number (30466584).

Almost surely, 2^81244222 is an apocalyptic number.

81244222 is a deficient number, since it is larger than the sum of its proper divisors (40622114).

81244222 is a wasteful number, since it uses less digits than its factorization.

81244222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40622113.

The product of its digits is 2048, while the sum is 25.

The square root of 81244222 is about 9013.5576771883. The cubic root of 81244222 is about 433.1092854947.

The spelling of 81244222 in words is "eighty-one million, two hundred forty-four thousand, two hundred twenty-two".