81083563 has 8 divisors (see below), whose sum is σ = 88657200. Its totient is φ = 73543680.

The previous prime is 81083521. The next prime is 81083573. The reversal of 81083563 is 36538018.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81083563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81083503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3270 + ... + 13147.

It is an arithmetic number, because the mean of its divisors is an integer number (11082150).

Almost surely, 2^81083563 is an apocalyptic number.

81083563 is a deficient number, since it is larger than the sum of its proper divisors (7573637).

81083563 is a wasteful number, since it uses less digits than its factorization.

81083563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16877.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 81083563 is about 9004.6411921853. The cubic root of 81083563 is about 432.8236084756.

The spelling of 81083563 in words is "eighty-one million, eighty-three thousand, five hundred sixty-three".