81303873 has 16 divisors (see below), whose sum is σ = 129278976. Its totient is φ = 44439120.

The previous prime is 81303853. The next prime is 81303899. The reversal of 81303873 is 37830318.

It is not a de Polignac number, because 81303873 - 2¹⁶ = 81238337 is a prime.

It is a super-3 number, since 3×81303873³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (81303853) 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 15 ways as a sum of consecutive naturals, for example, 83683 + ... + 84648.

It is an arithmetic number, because the mean of its divisors is an integer number (8079936).

Almost surely, 2^81303873 is an apocalyptic number.

It is an amenable number.

81303873 is a deficient number, since it is larger than the sum of its proper divisors (47975103).

81303873 is a wasteful number, since it uses less digits than its factorization.

81303873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168364.

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 81303873 is about 9016.8660298354. The cubic root of 81303873 is about 433.2152584939.

The spelling of 81303873 in words is "eighty-one million, three hundred three thousand, eight hundred seventy-three".