81189022134 has 192 divisors, whose sum is σ = 188406259200. Its totient is φ = 23316216000.

The previous prime is 81189022121. The next prime is 81189022157. The reversal of 81189022134 is 43122098118.

It is a junction number, because it is equal to n+sod(n) for n = 81189022092 and 81189022101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 544892692 + ... + 544892840.

It is an arithmetic number, because the mean of its divisors is an integer number (981282600).

Almost surely, 2^81189022134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81189022134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94203129600).

81189022134 is an abundant number, since it is smaller than the sum of its proper divisors (107217237066).

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

81189022134 is a wasteful number, since it uses less digits than its factorization.

81189022134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The spelling of 81189022134 in words is "eighty-one billion, one hundred eighty-nine million, twenty-two thousand, one hundred thirty-four".