81944522 has 16 divisors (see below), whose sum is σ = 141979392. Its totient is φ = 35056320.

The previous prime is 81944521. The next prime is 81944543. The reversal of 81944522 is 22544918.

It is not an unprimeable number, because it can be changed into a prime (81944521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109178 + ... + 109925.

It is an arithmetic number, because the mean of its divisors is an integer number (8873712).

Almost surely, 2^81944522 is an apocalyptic number.

81944522 is a deficient number, since it is larger than the sum of its proper divisors (60034870).

81944522 is a wasteful number, since it uses less digits than its factorization.

81944522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219133.

The product of its digits is 23040, while the sum is 35.

The square root of 81944522 is about 9052.3213597397. The cubic root of 81944522 is about 434.3501495850.

The spelling of 81944522 in words is "eighty-one million, nine hundred forty-four thousand, five hundred twenty-two".