81112266 has 20 divisors (see below), whose sum is σ = 181751922. Its totient is φ = 27037368.

The previous prime is 81112259. The next prime is 81112279. The reversal of 81112266 is 66221118.

It can be written as a sum of positive squares in only one way, i.e., 54331641 + 26780625 = 7371^2 + 5175^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 250185 + ... + 250508.

Almost surely, 2^81112266 is an apocalyptic number.

81112266 is an abundant number, since it is smaller than the sum of its proper divisors (100639656).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81112266 is a wasteful number, since it uses less digits than its factorization.

81112266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500707 (or 500698 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 81112266 is about 9006.2348403759. The cubic root of 81112266 is about 432.8746746019.

The spelling of 81112266 in words is "eighty-one million, one hundred twelve thousand, two hundred sixty-six".