91111002000 has 80 divisors (see below), whose sum is σ = 293741889792. Its totient is φ = 24296265600.

The previous prime is 91111001957. The next prime is 91111002013. The reversal of 91111002000 is 20011119.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7586584 + ... + 7598583.

Almost surely, 2^91111002000 is an apocalyptic number.

It is an amenable number.

91111002000 is an abundant number, since it is smaller than the sum of its proper divisors (202630887792).

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

91111002000 is a wasteful number, since it uses less digits than its factorization.

91111002000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15185193 (or 15185177 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 15.

Adding to 91111002000 its reverse (20011119), we get a palindrome (91131013119).

The spelling of 91111002000 in words is "ninety-one billion, one hundred eleven million, two thousand".