81115383 has 16 divisors (see below), whose sum is σ = 111398400. Its totient is φ = 52478400.

The previous prime is 81115379. The next prime is 81115393. The reversal of 81115383 is 38351118.

It is not a de Polignac number, because 81115383 - 2² = 81115379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81115383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81115393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11083 + ... + 16883.

It is an arithmetic number, because the mean of its divisors is an integer number (6962400).

Almost surely, 2^81115383 is an apocalyptic number.

81115383 is a deficient number, since it is larger than the sum of its proper divisors (30283017).

81115383 is a wasteful number, since it uses less digits than its factorization.

81115383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5942.

The product of its digits is 2880, while the sum is 30.

The square root of 81115383 is about 9006.4078855002. The cubic root of 81115383 is about 432.8802193986.

The spelling of 81115383 in words is "eighty-one million, one hundred fifteen thousand, three hundred eighty-three".