81243833 has 8 divisors (see below), whose sum is σ = 93843360. Its totient is φ = 69513280.

The previous prime is 81243793. The next prime is 81243847. The reversal of 81243833 is 33834218.

It is a happy number.

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 81243833 - 2⁶ = 81243769 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81243833.

It is not an unprimeable number, because it can be changed into a prime (81243853) 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, 217043 + ... + 217416.

It is an arithmetic number, because the mean of its divisors is an integer number (11730420).

Almost surely, 2^81243833 is an apocalyptic number.

It is an amenable number.

81243833 is a deficient number, since it is larger than the sum of its proper divisors (12599527).

81243833 is a wasteful number, since it uses less digits than its factorization.

81243833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 434487.

The product of its digits is 13824, while the sum is 32.

The square root of 81243833 is about 9013.5360985575. The cubic root of 81243833 is about 433.1085942464.

The spelling of 81243833 in words is "eighty-one million, two hundred forty-three thousand, eight hundred thirty-three".