81112423 has 16 divisors (see below), whose sum is σ = 98426880. Its totient is φ = 65252736.

The previous prime is 81112403. The next prime is 81112429. The reversal of 81112423 is 32421118.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81112423 - 2⁹ = 81111911 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81112394 and 81112403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81112429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56290 + ... + 57712.

It is an arithmetic number, because the mean of its divisors is an integer number (6151680).

Almost surely, 2^81112423 is an apocalyptic number.

81112423 is a deficient number, since it is larger than the sum of its proper divisors (17314457).

81112423 is a wasteful number, since it uses less digits than its factorization.

81112423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1926.

The product of its digits is 384, while the sum is 22.

The square root of 81112423 is about 9006.2435565556. The cubic root of 81112423 is about 432.8749538908.

The spelling of 81112423 in words is "eighty-one million, one hundred twelve thousand, four hundred twenty-three".