81043929 has 16 divisors (see below), whose sum is σ = 122035840. Its totient is φ = 53142480.

The previous prime is 81043909. The next prime is 81043957. The reversal of 81043929 is 92934018.

It is not a de Polignac number, because 81043929 - 2¹¹ = 81041881 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81043893 and 81043902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81043909) 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 15 ways as a sum of consecutive naturals, for example, 22957 + ... + 26250.

It is an arithmetic number, because the mean of its divisors is an integer number (7627240).

Almost surely, 2^81043929 is an apocalyptic number.

It is an amenable number.

81043929 is a deficient number, since it is larger than the sum of its proper divisors (40991911).

81043929 is a wasteful number, since it uses less digits than its factorization.

81043929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49277 (or 49271 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 81043929 is about 9002.4401691986. The cubic root of 81043929 is about 432.7530749581.

The spelling of 81043929 in words is "eighty-one million, forty-three thousand, nine hundred twenty-nine".