81424833 has 8 divisors (see below), whose sum is σ = 124075968. Its totient is φ = 46528464.

The previous prime is 81424831. The next prime is 81424877. The reversal of 81424833 is 33842418.

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

It is not a de Polignac number, because 81424833 - 2¹ = 81424831 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81424794 and 81424803.

It is not an unprimeable number, because it can be changed into a prime (81424831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1938666 + ... + 1938707.

It is an arithmetic number, because the mean of its divisors is an integer number (15509496).

Almost surely, 2^81424833 is an apocalyptic number.

It is an amenable number.

81424833 is a deficient number, since it is larger than the sum of its proper divisors (42651135).

81424833 is a wasteful number, since it uses less digits than its factorization.

81424833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3877383.

The product of its digits is 18432, while the sum is 33.

The square root of 81424833 is about 9023.5709671948. The cubic root of 81424833 is about 433.4299909958.

The spelling of 81424833 in words is "eighty-one million, four hundred twenty-four thousand, eight hundred thirty-three".