81332222 has 8 divisors (see below), whose sum is σ = 122119536. Its totient is φ = 40625712.

The previous prime is 81332201. The next prime is 81332239. The reversal of 81332222 is 22223318.

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

It is a super-2 number, since 2×81332222² = 13229860670914568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17618 + ... + 21749.

It is an arithmetic number, because the mean of its divisors is an integer number (15264942).

Almost surely, 2^81332222 is an apocalyptic number.

81332222 is a deficient number, since it is larger than the sum of its proper divisors (40787314).

81332222 is a wasteful number, since it uses less digits than its factorization.

81332222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40402.

The product of its digits is 1152, while the sum is 23.

The square root of 81332222 is about 9018.4378913424. The cubic root of 81332222 is about 433.2656037472.

The spelling of 81332222 in words is "eighty-one million, three hundred thirty-two thousand, two hundred twenty-two".