81303333 has 8 divisors (see below), whose sum is σ = 114781248. Its totient is φ = 51013824.

The previous prime is 81303331. The next prime is 81303349. The reversal of 81303333 is 33330318.

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

It is not a de Polignac number, because 81303333 - 2¹ = 81303331 is a prime.

It is a super-2 number, since 2×81303333² = 13220463913817778, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81303331) 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 7 ways as a sum of consecutive naturals, for example, 797041 + ... + 797142.

It is an arithmetic number, because the mean of its divisors is an integer number (14347656).

Almost surely, 2^81303333 is an apocalyptic number.

It is an amenable number.

81303333 is a deficient number, since it is larger than the sum of its proper divisors (33477915).

81303333 is a wasteful number, since it uses less digits than its factorization.

81303333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1594203.

The product of its (nonzero) digits is 1944, while the sum is 24.

The square root of 81303333 is about 9016.8360859006. The cubic root of 81303333 is about 433.2142993893.

The spelling of 81303333 in words is "eighty-one million, three hundred three thousand, three hundred thirty-three".