81033563 has 8 divisors (see below), whose sum is σ = 87392256. Its totient is φ = 74692800.

The previous prime is 81033551. The next prime is 81033581. The reversal of 81033563 is 36533018.

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

It is not a de Polignac number, because 81033563 - 2⁸ = 81033307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81033503) 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, 5798 + ... + 13988.

It is an arithmetic number, because the mean of its divisors is an integer number (10924032).

Almost surely, 2^81033563 is an apocalyptic number.

81033563 is a deficient number, since it is larger than the sum of its proper divisors (6358693).

81033563 is a wasteful number, since it uses less digits than its factorization.

81033563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8965.

The product of its (nonzero) digits is 6480, while the sum is 29.

The square root of 81033563 is about 9001.8644179970. The cubic root of 81033563 is about 432.7346236083.

The spelling of 81033563 in words is "eighty-one million, thirty-three thousand, five hundred sixty-three".