91531711693 has 8 divisors (see below), whose sum is σ = 93770179776. Its totient is φ = 89293528800.

The previous prime is 91531711673. The next prime is 91531711721. The reversal of 91531711693 is 39611713519.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91531711693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91531711603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 672030 + ... + 796672.

It is an arithmetic number, because the mean of its divisors is an integer number (11721272472).

Almost surely, 2^91531711693 is an apocalyptic number.

It is an amenable number.

91531711693 is a deficient number, since it is larger than the sum of its proper divisors (2238468083).

91531711693 is a wasteful number, since it uses less digits than its factorization.

91531711693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142595.

The product of its digits is 153090, while the sum is 46.

The spelling of 91531711693 in words is "ninety-one billion, five hundred thirty-one million, seven hundred eleven thousand, six hundred ninety-three".