81113420 has 12 divisors (see below), whose sum is σ = 170338224. Its totient is φ = 32445360.

The previous prime is 81113407. The next prime is 81113429. The reversal of 81113420 is 2431118.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 4055671 = 81113420 / (8 + 1 + 1 + 1 + 3 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 81113392 and 81113401.

It is not an unprimeable number, because it can be changed into a prime (81113429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2027816 + ... + 2027855.

It is an arithmetic number, because the mean of its divisors is an integer number (14194852).

Almost surely, 2^81113420 is an apocalyptic number.

It is an amenable number.

81113420 is an abundant number, since it is smaller than the sum of its proper divisors (89224804).

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

81113420 is a wasteful number, since it uses less digits than its factorization.

81113420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4055680 (or 4055678 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 81113420 is about 9006.2989068762. The cubic root of 81113420 is about 432.8767274562.

Adding to 81113420 its reverse (2431118), we get a palindrome (83544538).

The spelling of 81113420 in words is "eighty-one million, one hundred thirteen thousand, four hundred twenty".