81330369 has 8 divisors (see below), whose sum is σ = 113155392. Its totient is φ = 51862800.

The previous prime is 81330343. The next prime is 81330377. The reversal of 81330369 is 96303318.

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

It is not a de Polignac number, because 81330369 - 2⁸ = 81330113 is a prime.

It is a super-2 number, since 2×81330369² = 13229257843352322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (81330269) 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, 589282 + ... + 589419.

It is an arithmetic number, because the mean of its divisors is an integer number (14144424).

Almost surely, 2^81330369 is an apocalyptic number.

It is an amenable number.

81330369 is a deficient number, since it is larger than the sum of its proper divisors (31825023).

81330369 is a wasteful number, since it uses less digits than its factorization.

81330369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178727.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 81330369 is about 9018.3351567792. The cubic root of 81330369 is about 433.2623133446.

The spelling of 81330369 in words is "eighty-one million, three hundred thirty thousand, three hundred sixty-nine".