91111145847 has 4 divisors (see below), whose sum is σ = 121481527800. Its totient is φ = 60740763896.

The previous prime is 91111145843. The next prime is 91111145849. The reversal of 91111145847 is 74854111119.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91111145847 - 2² = 91111145843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91111145799 and 91111145808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91111145843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15185190972 + ... + 15185190977.

It is an arithmetic number, because the mean of its divisors is an integer number (30370381950).

Almost surely, 2^91111145847 is an apocalyptic number.

91111145847 is a deficient number, since it is larger than the sum of its proper divisors (30370381953).

91111145847 is a wasteful number, since it uses less digits than its factorization.

91111145847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30370381952.

The product of its digits is 40320, while the sum is 42.

The spelling of 91111145847 in words is "ninety-one billion, one hundred eleven million, one hundred forty-five thousand, eight hundred forty-seven".