91106947985 has 8 divisors (see below), whose sum is σ = 109413030336. Its totient is φ = 72829096560.

The previous prime is 91106947907. The next prime is 91106947993. The reversal of 91106947985 is 58974960119.

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

It is a de Polignac number, because none of the positive numbers 2^k-91106947985 is a prime.

It is a super-2 number, since 2×91106947985² (a number of 23 digits) contains 22 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 7050629 + ... + 7063538.

It is an arithmetic number, because the mean of its divisors is an integer number (13676628792).

Almost surely, 2^91106947985 is an apocalyptic number.

It is an amenable number.

91106947985 is a deficient number, since it is larger than the sum of its proper divisors (18306082351).

91106947985 is a wasteful number, since it uses less digits than its factorization.

91106947985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14115463.

The product of its (nonzero) digits is 4898880, while the sum is 59.

The spelling of 91106947985 in words is "ninety-one billion, one hundred six million, nine hundred forty-seven thousand, nine hundred eighty-five".