91731791542 has 8 divisors (see below), whose sum is σ = 137617146000. Its totient is φ = 45859409544.

The previous prime is 91731791527. The next prime is 91731791579. The reversal of 91731791542 is 24519713719.

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, 3225417 + ... + 3253732.

It is an arithmetic number, because the mean of its divisors is an integer number (17202143250).

Almost surely, 2^91731791542 is an apocalyptic number.

91731791542 is a deficient number, since it is larger than the sum of its proper divisors (45885354458).

91731791542 is a wasteful number, since it uses less digits than its factorization.

91731791542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6486230.

The product of its digits is 476280, while the sum is 49.

The spelling of 91731791542 in words is "ninety-one billion, seven hundred thirty-one million, seven hundred ninety-one thousand, five hundred forty-two".