81541843829 has 16 divisors (see below), whose sum is σ = 90997025280. Its totient is φ = 72737714880.

The previous prime is 81541843759. The next prime is 81541843843. The reversal of 81541843829 is 92834814518.

It is a cyclic number.

It is not a de Polignac number, because 81541843829 - 2³⁶ = 12822367093 is a prime.

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81541843529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1849034 + ... + 1892619.

It is an arithmetic number, because the mean of its divisors is an integer number (5687314080).

Almost surely, 2^81541843829 is an apocalyptic number.

It is an amenable number.

81541843829 is a deficient number, since it is larger than the sum of its proper divisors (9455181451).

81541843829 is a wasteful number, since it uses less digits than its factorization.

81541843829 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3741740.

The product of its digits is 2211840, while the sum is 53.

The spelling of 81541843829 in words is "eighty-one billion, five hundred forty-one million, eight hundred forty-three thousand, eight hundred twenty-nine".