81234433 has 4 divisors (see below), whose sum is σ = 92839360. Its totient is φ = 69629508.

The previous prime is 81234431. The next prime is 81234479. The reversal of 81234433 is 33443218.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33443218 = 2 ⋅16721609.

It is a cyclic number.

It is not a de Polignac number, because 81234433 - 2¹ = 81234431 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81234431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5802453 + ... + 5802466.

It is an arithmetic number, because the mean of its divisors is an integer number (23209840).

Almost surely, 2^81234433 is an apocalyptic number.

It is an amenable number.

81234433 is a deficient number, since it is larger than the sum of its proper divisors (11604927).

81234433 is a wasteful number, since it uses less digits than its factorization.

81234433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11604926.

The product of its digits is 6912, while the sum is 28.

The square root of 81234433 is about 9013.0146455001. The cubic root of 81234433 is about 433.0918898901.

It can be divided in two parts, 812 and 34433, that added together give a triangular number (35245 = T₂₆₅).

The spelling of 81234433 in words is "eighty-one million, two hundred thirty-four thousand, four hundred thirty-three".