91731475842 has 16 divisors (see below), whose sum is σ = 183558877920. Its totient is φ = 30561170912.

The previous prime is 91731475819. The next prime is 91731475879. The reversal of 91731475842 is 24857413719.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3984492 + ... + 4007447.

It is an arithmetic number, because the mean of its divisors is an integer number (11472429870).

Almost surely, 2^91731475842 is an apocalyptic number.

91731475842 is an abundant number, since it is smaller than the sum of its proper divisors (91827402078).

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

91731475842 is a wasteful number, since it uses less digits than its factorization.

91731475842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7993857.

The product of its digits is 1693440, while the sum is 51.

The spelling of 91731475842 in words is "ninety-one billion, seven hundred thirty-one million, four hundred seventy-five thousand, eight hundred forty-two".