81111102 has 16 divisors (see below), whose sum is σ = 162582672. Its totient is φ = 26976960.

The previous prime is 81111101. The next prime is 81111119. The reversal of 81111102 is 20111118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81111101) 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, 12049 + ... + 17532.

It is an arithmetic number, because the mean of its divisors is an integer number (10161417).

Almost surely, 2^81111102 is an apocalyptic number.

81111102 is an abundant number, since it is smaller than the sum of its proper divisors (81471570).

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

81111102 is a wasteful number, since it uses less digits than its factorization.

81111102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30043.

The product of its (nonzero) digits is 16, while the sum is 15.

The square root of 81111102 is about 9006.1702182448. The cubic root of 81111102 is about 432.8726039387.

Adding to 81111102 its product of nonzero digits (16), we get a palindrome (81111118).

The spelling of 81111102 in words is "eighty-one million, one hundred eleven thousand, one hundred two".