81803516 has 12 divisors (see below), whose sum is σ = 145293288. Its totient is φ = 40291152.

The previous prime is 81803497. The next prime is 81803521. The reversal of 81803516 is 61530818.

It is a congruent number.

It is an unprimeable number.

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, 152351 + ... + 152886.

It is an arithmetic number, because the mean of its divisors is an integer number (12107774).

Almost surely, 2^81803516 is an apocalyptic number.

It is an amenable number.

81803516 is a deficient number, since it is larger than the sum of its proper divisors (63489772).

81803516 is a wasteful number, since it uses less digits than its factorization.

81803516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305308 (or 305306 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 81803516 is about 9044.5296173986. The cubic root of 81803516 is about 434.1008706055.

The spelling of 81803516 in words is "eighty-one million, eight hundred three thousand, five hundred sixteen".