81112424 has 16 divisors (see below), whose sum is σ = 152207520. Its totient is φ = 40523760.

The previous prime is 81112403. The next prime is 81112429. The reversal of 81112424 is 42421118.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 81112424.

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 3 ways as a sum of consecutive naturals, for example, 9059 + ... + 15629.

It is an arithmetic number, because the mean of its divisors is an integer number (9512970).

Almost surely, 2^81112424 is an apocalyptic number.

It is an amenable number.

81112424 is a deficient number, since it is larger than the sum of its proper divisors (71095096).

81112424 is a wasteful number, since it uses less digits than its factorization.

81112424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8120 (or 8116 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 81112424 is about 9006.2436120727. The cubic root of 81112424 is about 432.8749556697.

The spelling of 81112424 in words is "eighty-one million, one hundred twelve thousand, four hundred twenty-four".