81109522 has 24 divisors (see below), whose sum is σ = 132333156. Its totient is φ = 37267776.

The previous prime is 81109519. The next prime is 81109529. The reversal of 81109522 is 22590118.

It can be written as a sum of positive squares in 6 ways, for example, as 2627641 + 78481881 = 1621^2 + 8859^2 .

It is not an unprimeable number, because it can be changed into a prime (81109529) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 106768 + ... + 107524.

Almost surely, 2^81109522 is an apocalyptic number.

81109522 is a deficient number, since it is larger than the sum of its proper divisors (51223634).

81109522 is a wasteful number, since it uses less digits than its factorization.

81109522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1102 (or 1089 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 81109522 is about 9006.0825001773. The cubic root of 81109522 is about 432.8697932131.

The spelling of 81109522 in words is "eighty-one million, one hundred nine thousand, five hundred twenty-two".