91001820011 has 8 divisors (see below), whose sum is σ = 95529523200. Its totient is φ = 86573626920.

The previous prime is 91001820001. The next prime is 91001820017. The reversal of 91001820011 is 11002810019.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91001820011 - 2⁶ = 91001819947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91001820017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24875651 + ... + 24879308.

It is an arithmetic number, because the mean of its divisors is an integer number (11941190400).

Almost surely, 2^91001820011 is an apocalyptic number.

91001820011 is a deficient number, since it is larger than the sum of its proper divisors (4527703189).

91001820011 is a wasteful number, since it uses less digits than its factorization.

91001820011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49755049.

The product of its (nonzero) digits is 144, while the sum is 23.

The spelling of 91001820011 in words is "ninety-one billion, one million, eight hundred twenty thousand, eleven".