91440100111 has 4 divisors (see below), whose sum is σ = 91444330432. Its totient is φ = 91435869792.

The previous prime is 91440100097. The next prime is 91440100117. The reversal of 91440100111 is 11100104419.

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 91440100111 - 2¹¹ = 91440098063 is a prime.

It is a super-2 number, since 2×91440100111² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91440100117) 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, 2082570 + ... + 2126023.

It is an arithmetic number, because the mean of its divisors is an integer number (22861082608).

Almost surely, 2^91440100111 is an apocalyptic number.

91440100111 is a deficient number, since it is larger than the sum of its proper divisors (4230321).

91440100111 is a wasteful number, since it uses less digits than its factorization.

91440100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4230320.

The product of its (nonzero) digits is 144, while the sum is 22.

The spelling of 91440100111 in words is "ninety-one billion, four hundred forty million, one hundred thousand, one hundred eleven".