91187081845 has 8 divisors (see below), whose sum is σ = 109604772864. Its totient is φ = 72829482384.

The previous prime is 91187081833. The next prime is 91187081851. The reversal of 91187081845 is 54818078119.

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

It is a cyclic number.

It is not a de Polignac number, because 91187081845 - 2⁷ = 91187081717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91187081792 and 91187081801.

It is a congruent number.

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, 15019549 + ... + 15025618.

It is an arithmetic number, because the mean of its divisors is an integer number (13700596608).

Almost surely, 2^91187081845 is an apocalyptic number.

It is an amenable number.

91187081845 is a deficient number, since it is larger than the sum of its proper divisors (18417691019).

91187081845 is a wasteful number, since it uses less digits than its factorization.

91187081845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30045779.

The product of its (nonzero) digits is 645120, while the sum is 52.

The spelling of 91187081845 in words is "ninety-one billion, one hundred eighty-seven million, eighty-one thousand, eight hundred forty-five".