91111827156 has 144 divisors (see below), whose sum is σ = 260507036160. Its totient is φ = 24644088000.

The previous prime is 91111827119. The next prime is 91111827173. The reversal of 91111827156 is 65172811119.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25146361 + ... + 25149983.

It is an arithmetic number, because the mean of its divisors is an integer number (1809076640).

Almost surely, 2^91111827156 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91111827156, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130253518080).

91111827156 is an abundant number, since it is smaller than the sum of its proper divisors (169395209004).

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

91111827156 is a wasteful number, since it uses less digits than its factorization.

91111827156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5914 (or 5905 counting only the distinct ones).

The product of its digits is 30240, while the sum is 42.

The spelling of 91111827156 in words is "ninety-one billion, one hundred eleven million, eight hundred twenty-seven thousand, one hundred fifty-six".