81992803 has 2 divisors, whose sum is σ = 81992804. Its totient is φ = 81992802.

The previous prime is 81992783. The next prime is 81992837. The reversal of 81992803 is 30829918.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 81992803 - 2¹³ = 81984611 is a prime.

It is not a weakly prime, because it can be changed into another prime (81992843) 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 as a sum of consecutive naturals, namely, 40996401 + 40996402.

It is an arithmetic number, because the mean of its divisors is an integer number (40996402).

Almost surely, 2^81992803 is an apocalyptic number.

81992803 is a deficient number, since it is larger than the sum of its proper divisors (1).

81992803 is an equidigital number, since it uses as much as digits as its factorization.

81992803 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 40.

The square root of 81992803 is about 9054.9877415709. The cubic root of 81992803 is about 434.4354379476.

The spelling of 81992803 in words is "eighty-one million, nine hundred ninety-two thousand, eight hundred three".