81071112 has 16 divisors (see below), whose sum is σ = 202677840. Its totient is φ = 27023696.

The previous prime is 81071077. The next prime is 81071129. The reversal of 81071112 is 21117018.

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, 1688958 + ... + 1689005.

It is an arithmetic number, because the mean of its divisors is an integer number (12667365).

Almost surely, 2^81071112 is an apocalyptic number.

It is an amenable number.

81071112 is an abundant number, since it is smaller than the sum of its proper divisors (121606728).

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

81071112 is a wasteful number, since it uses less digits than its factorization.

81071112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377972 (or 3377968 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 21.

The square root of 81071112 is about 9003.9497999489. The cubic root of 81071112 is about 432.8014528852.

The spelling of 81071112 in words is "eighty-one million, seventy-one thousand, one hundred twelve".