81930303 has 72 divisors (see below), whose sum is σ = 153369216. Its totient is φ = 41731200.

The previous prime is 81930283. The next prime is 81930319. The reversal of 81930303 is 30303918.

It is not a de Polignac number, because 81930303 - 2⁵ = 81930271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81930323) 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 in 71 ways as a sum of consecutive naturals, for example, 177493 + ... + 177953.

It is an arithmetic number, because the mean of its divisors is an integer number (2130128).

Almost surely, 2^81930303 is an apocalyptic number.

81930303 is a deficient number, since it is larger than the sum of its proper divisors (71438913).

81930303 is a wasteful number, since it uses less digits than its factorization.

81930303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525 (or 515 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 81930303 is about 9051.5359470092. The cubic root of 81930303 is about 434.3250253429.

The spelling of 81930303 in words is "eighty-one million, nine hundred thirty thousand, three hundred three".