81303 has 8 divisors (see below), whose sum is σ = 111216. Its totient is φ = 52800.

The previous prime is 81299. The next prime is 81307. The reversal of 81303 is 30318.

It is an interprime number because it is at equal distance from previous prime (81299) and next prime (81307).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81303 - 2² = 81299 is a prime.

It is a super-2 number, since 2×81303² = 13220355618, which contains 22 as substring.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81307) 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 7 ways as a sum of consecutive naturals, for example, 208 + ... + 453.

It is an arithmetic number, because the mean of its divisors is an integer number (13902).

2⁸¹³⁰³ is an apocalyptic number.

81303 is a deficient number, since it is larger than the sum of its proper divisors (29913).

81303 is a wasteful number, since it uses less digits than its factorization.

81303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 705.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 81303 is about 285.1368092688. The cubic root of 81303 is about 43.3213707939.

Adding to 81303 its sum of digits (15), we get a palindrome (81318).

The spelling of 81303 in words is "eighty-one thousand, three hundred three".