81129333 has 8 divisors (see below), whose sum is σ = 108475200. Its totient is φ = 53934848.

The previous prime is 81129331. The next prime is 81129341. The reversal of 81129333 is 33392118.

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

It is a cyclic number.

It is not a de Polignac number, because 81129333 - 2¹ = 81129331 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81129333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81129331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36588 + ... + 38741.

It is an arithmetic number, because the mean of its divisors is an integer number (13559400).

Almost surely, 2^81129333 is an apocalyptic number.

It is an amenable number.

81129333 is a deficient number, since it is larger than the sum of its proper divisors (27345867).

81129333 is a wasteful number, since it uses less digits than its factorization.

81129333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75691.

The product of its digits is 3888, while the sum is 30.

The square root of 81129333 is about 9007.1823008086. The cubic root of 81129333 is about 432.9050331585.

The spelling of 81129333 in words is "eighty-one million, one hundred twenty-nine thousand, three hundred thirty-three".