91000111201 has 16 divisors (see below), whose sum is σ = 94914590400. Its totient is φ = 87138733248.

The previous prime is 91000111199. The next prime is 91000111207. The reversal of 91000111201 is 10211100019.

It is a cyclic number.

It is not a de Polignac number, because 91000111201 - 2¹ = 91000111199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91000111207) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4007586 + ... + 4030228.

It is an arithmetic number, because the mean of its divisors is an integer number (5932161900).

Almost surely, 2^91000111201 is an apocalyptic number.

It is an amenable number.

91000111201 is a deficient number, since it is larger than the sum of its proper divisors (3914479199).

91000111201 is a wasteful number, since it uses less digits than its factorization.

91000111201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23808.

The product of its (nonzero) digits is 18, while the sum is 16.

The spelling of 91000111201 in words is "ninety-one billion, one hundred eleven thousand, two hundred one".