91001113111 has 4 divisors (see below), whose sum is σ = 95790645400. Its totient is φ = 86211580824.

The previous prime is 91001113103. The next prime is 91001113117. The reversal of 91001113111 is 11131110019.

It is a happy number.

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 91001113111 - 2³ = 91001113103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 4789532269 = 91001113111 / (9 + 1 + 0 + 0 + 1 + 1 + 1 + 3 + 1 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91001113117) 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, 2394766116 + ... + 2394766153.

It is an arithmetic number, because the mean of its divisors is an integer number (23947661350).

Almost surely, 2^91001113111 is an apocalyptic number.

91001113111 is a deficient number, since it is larger than the sum of its proper divisors (4789532289).

91001113111 is a wasteful number, since it uses less digits than its factorization.

91001113111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4789532288.

The product of its (nonzero) digits is 27, while the sum is 19.

It can be divided in two parts, 9100 and 1113111, that added together give a palindrome (1122211).

The spelling of 91001113111 in words is "ninety-one billion, one million, one hundred thirteen thousand, one hundred eleven".