81168243 has 8 divisors (see below), whose sum is σ = 116549328. Its totient is φ = 49949664.

The previous prime is 81168211. The next prime is 81168259. The reversal of 81168243 is 34286118.

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

It is not a de Polignac number, because 81168243 - 2⁵ = 81168211 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81168203) 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, 1040580 + ... + 1040657.

It is an arithmetic number, because the mean of its divisors is an integer number (14568666).

Almost surely, 2^81168243 is an apocalyptic number.

81168243 is a deficient number, since it is larger than the sum of its proper divisors (35381085).

81168243 is a wasteful number, since it uses less digits than its factorization.

81168243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2081253.

The product of its digits is 9216, while the sum is 33.

The square root of 81168243 is about 9009.3419848511. The cubic root of 81168243 is about 432.9742298434.

The spelling of 81168243 in words is "eighty-one million, one hundred sixty-eight thousand, two hundred forty-three".