81113289 has 8 divisors (see below), whose sum is σ = 108417120. Its totient is φ = 53942496.

The previous prime is 81113269. The next prime is 81113297. The reversal of 81113289 is 98231118.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81113289 - 2¹¹ = 81111241 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81113269) 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 7 ways as a sum of consecutive naturals, for example, 31827 + ... + 34280.

It is an arithmetic number, because the mean of its divisors is an integer number (13552140).

Almost surely, 2^81113289 is an apocalyptic number.

It is an amenable number.

81113289 is a deficient number, since it is larger than the sum of its proper divisors (27303831).

81113289 is a wasteful number, since it uses less digits than its factorization.

81113289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66519.

The product of its digits is 3456, while the sum is 33.

The square root of 81113289 is about 9006.2916341855. The cubic root of 81113289 is about 432.8764944209.

The spelling of 81113289 in words is "eighty-one million, one hundred thirteen thousand, two hundred eighty-nine".