81234434 has 4 divisors (see below), whose sum is σ = 121851654. Its totient is φ = 40617216.

The previous prime is 81234431. The next prime is 81234479. The reversal of 81234434 is 43443218.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 48344209 + 32890225 = 6953^2 + 5735^2 .

It is a junction number, because it is equal to n+sod(n) for n = 81234397 and 81234406.

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 as a sum of consecutive naturals, namely, 20308607 + ... + 20308610.

Almost surely, 2^81234434 is an apocalyptic number.

81234434 is a deficient number, since it is larger than the sum of its proper divisors (40617220).

81234434 is a wasteful number, since it uses less digits than its factorization.

81234434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40617219.

The product of its digits is 9216, while the sum is 29.

The square root of 81234434 is about 9013.0147009755. The cubic root of 81234434 is about 433.0918916672.

The spelling of 81234434 in words is "eighty-one million, two hundred thirty-four thousand, four hundred thirty-four".