81934129235 has 16 divisors (see below), whose sum is σ = 117252320256. Its totient is φ = 53740645728.

The previous prime is 81934129201. The next prime is 81934129243. The reversal of 81934129235 is 53292143918.

It is not a de Polignac number, because 81934129235 - 2⁸ = 81934128979 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 81934129235.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50889959 + ... + 50891568.

It is an arithmetic number, because the mean of its divisors is an integer number (7328270016).

Almost surely, 2^81934129235 is an apocalyptic number.

81934129235 is a deficient number, since it is larger than the sum of its proper divisors (35318191021).

81934129235 is a wasteful number, since it uses less digits than its factorization.

81934129235 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101781562.

The product of its digits is 466560, while the sum is 47.

The spelling of 81934129235 in words is "eighty-one billion, nine hundred thirty-four million, one hundred twenty-nine thousand, two hundred thirty-five".