91011000111001 has 4 divisors (see below), whose sum is σ = 91011239869732. Its totient is φ = 91010760352272.

The previous prime is 91011000110983. The next prime is 91011000111049. The reversal of 91011000111001 is 10011100011019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 54546732851776 + 36464267259225 = 7385576^2 + 6038565^2 .

It is a cyclic number.

It is not a de Polignac number, because 91011000111001 - 2⁹ = 91011000110489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91011000111071) 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, 119309070 + ... + 120069463.

It is an arithmetic number, because the mean of its divisors is an integer number (22752809967433).

Almost surely, 2^{91011000111001} is an apocalyptic number.

It is an amenable number.

91011000111001 is a deficient number, since it is larger than the sum of its proper divisors (239758731).

91011000111001 is a wasteful number, since it uses less digits than its factorization.

91011000111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239758730.

The product of its (nonzero) digits is 9, while the sum is 16.

The spelling of 91011000111001 in words is "ninety-one trillion, eleven billion, one hundred eleven thousand, one".