81433 has 6 divisors (see below), whose sum is σ = 89642. Its totient is φ = 73920.

The previous prime is 81421. The next prime is 81439. The reversal of 81433 is 33418.

It is the 117-th star number.

It can be written as a sum of positive squares in only one way, i.e., 64009 + 17424 = 253^2 + 132^2 .

It is not a de Polignac number, because 81433 - 2⁵ = 81401 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 81433.

It is not an unprimeable number, because it can be changed into a prime (81439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 216 + ... + 457.

2⁸¹⁴³³ is an apocalyptic number.

It is an amenable number.

81433 is a deficient number, since it is larger than the sum of its proper divisors (8209).

81433 is a wasteful number, since it uses less digits than its factorization.

81433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695 (or 684 counting only the distinct ones).

The product of its digits is 288, while the sum is 19.

The square root of 81433 is about 285.3646789636. The cubic root of 81433 is about 43.3444481679.

It can be divided in two parts, 814 and 33, that multiplied together give a palindrome (26862).

The spelling of 81433 in words is "eighty-one thousand, four hundred thirty-three".