81433443 has 48 divisors (see below), whose sum is σ = 139324416. Its totient is φ = 41912640.

The previous prime is 81433441. The next prime is 81433447. The reversal of 81433443 is 34433418.

It is not a de Polignac number, because 81433443 - 2¹ = 81433441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81433443.

It is not an unprimeable number, because it can be changed into a prime (81433441) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81678 + ... + 82668.

It is an arithmetic number, because the mean of its divisors is an integer number (2902592).

Almost surely, 2^81433443 is an apocalyptic number.

81433443 is a deficient number, since it is larger than the sum of its proper divisors (57890973).

81433443 is a wasteful number, since it uses less digits than its factorization.

81433443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1064 (or 1057 counting only the distinct ones).

The product of its digits is 13824, while the sum is 30.

The square root of 81433443 is about 9024.0480384360. The cubic root of 81433443 is about 433.4452676650.

The spelling of 81433443 in words is "eighty-one million, four hundred thirty-three thousand, four hundred forty-three".