81111846 has 32 divisors (see below), whose sum is σ = 173226240. Its totient is φ = 25258464.

The previous prime is 81111799. The next prime is 81111853. The reversal of 81111846 is 64811118.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 901 + ... + 12768.

It is an arithmetic number, because the mean of its divisors is an integer number (5413320).

Almost surely, 2^81111846 is an apocalyptic number.

81111846 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

81111846 is an abundant number, since it is smaller than the sum of its proper divisors (92114394).

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

81111846 is a wasteful number, since it uses less digits than its factorization.

81111846 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13740.

The product of its digits is 1536, while the sum is 30.

The square root of 81111846 is about 9006.2115231656. The cubic root of 81111846 is about 432.8739274577.

The spelling of 81111846 in words is "eighty-one million, one hundred eleven thousand, eight hundred forty-six".