81003303 has 12 divisors (see below), whose sum is σ = 118923688. Its totient is φ = 53116560.

The previous prime is 81003301. The next prime is 81003319. The reversal of 81003303 is 30330018.

It is not a de Polignac number, because 81003303 - 2¹ = 81003301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81003301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73225 + ... + 74322.

Almost surely, 2^81003303 is an apocalyptic number.

81003303 is a deficient number, since it is larger than the sum of its proper divisors (37920385).

81003303 is a wasteful number, since it uses less digits than its factorization.

81003303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147614 (or 147611 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 81003303 is about 9000.1834981294. The cubic root of 81003303 is about 432.6807521855.

The spelling of 81003303 in words is "eighty-one million, three thousand, three hundred three".