81111116 has 12 divisors (see below), whose sum is σ = 142008720. Its totient is φ = 40537200.

The previous prime is 81111101. The next prime is 81111119. The reversal of 81111116 is 61111118.

It is not an unprimeable number, because it can be changed into a prime (81111119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12065 + ... + 17543.

It is an arithmetic number, because the mean of its divisors is an integer number (11834060).

Almost surely, 2^81111116 is an apocalyptic number.

It is an amenable number.

81111116 is a deficient number, since it is larger than the sum of its proper divisors (60897604).

81111116 is a wasteful number, since it uses less digits than its factorization.

81111116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9184 (or 9182 counting only the distinct ones).

The product of its digits is 48, while the sum is 20.

The square root of 81111116 is about 9006.1709954897. The cubic root of 81111116 is about 432.8726288437.

The spelling of 81111116 in words is "eighty-one million, one hundred eleven thousand, one hundred sixteen".