81194115234 has 128 divisors (see below), whose sum is σ = 180643921920. Its totient is φ = 24233126400.

The previous prime is 81194115221. The next prime is 81194115241. The reversal of 81194115234 is 43251149118.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 81194115192 and 81194115201.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 25523124 + ... + 25526304.

It is an arithmetic number, because the mean of its divisors is an integer number (1411280640).

Almost surely, 2^81194115234 is an apocalyptic number.

81194115234 is an abundant number, since it is smaller than the sum of its proper divisors (99449806686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81194115234 is a wasteful number, since it uses less digits than its factorization.

81194115234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3416.

The product of its digits is 34560, while the sum is 39.

The spelling of 81194115234 in words is "eighty-one billion, one hundred ninety-four million, one hundred fifteen thousand, two hundred thirty-four".