81133333 has 8 divisors (see below), whose sum is σ = 87117120. Its totient is φ = 75284160.

The previous prime is 81133321. The next prime is 81133391. The reversal of 81133333 is 33333118.

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

It is not a de Polignac number, because 81133333 - 2¹⁷ = 81002261 is a prime.

It is a Duffinian number.

81133333 is a modest number, since divided by 33333 gives 811 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 81133298 and 81133307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81133433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32403 + ... + 34816.

It is an arithmetic number, because the mean of its divisors is an integer number (10889640).

Almost surely, 2^81133333 is an apocalyptic number.

It is an amenable number.

81133333 is a deficient number, since it is larger than the sum of its proper divisors (5983787).

81133333 is a wasteful number, since it uses less digits than its factorization.

81133333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67307.

The product of its digits is 1944, while the sum is 25.

The square root of 81133333 is about 9007.4043430946. The cubic root of 81133333 is about 432.9121476904.

The spelling of 81133333 in words is "eighty-one million, one hundred thirty-three thousand, three hundred thirty-three".