81933917134 has 8 divisors (see below), whose sum is σ = 122903444160. Its totient is φ = 40966102416.

The previous prime is 81933917071. The next prime is 81933917159. The reversal of 81933917134 is 43171933918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300894 + ... + 504385.

It is an arithmetic number, because the mean of its divisors is an integer number (15362930520).

Almost surely, 2^81933917134 is an apocalyptic number.

81933917134 is a deficient number, since it is larger than the sum of its proper divisors (40969527026).

81933917134 is a wasteful number, since it uses less digits than its factorization.

81933917134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856154.

The product of its digits is 489888, while the sum is 49.

The spelling of 81933917134 in words is "eighty-one billion, nine hundred thirty-three million, nine hundred seventeen thousand, one hundred thirty-four".