81222027 has 16 divisors (see below), whose sum is σ = 109790208. Its totient is φ = 53406080.

The previous prime is 81222019. The next prime is 81222059. The reversal of 81222027 is 72022218.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81222027 - 2³ = 81222019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81221988 and 81222006.

It is not an unprimeable number, because it can be changed into a prime (81222007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88702 + ... + 89612.

It is an arithmetic number, because the mean of its divisors is an integer number (6861888).

Almost surely, 2^81222027 is an apocalyptic number.

81222027 is a deficient number, since it is larger than the sum of its proper divisors (28568181).

81222027 is a wasteful number, since it uses less digits than its factorization.

81222027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 81222027 is about 9012.3263922253. The cubic root of 81222027 is about 433.0698417210.

The spelling of 81222027 in words is "eighty-one million, two hundred twenty-two thousand, twenty-seven".