91989200911 has 4 divisors (see below), whose sum is σ = 92023185592. Its totient is φ = 91955216232.

The previous prime is 91989200899. The next prime is 91989200917. The reversal of 91989200911 is 11900298919.

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 91989200911 - 2⁷ = 91989200783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91989200917) 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, 16988280 + ... + 16993693.

It is an arithmetic number, because the mean of its divisors is an integer number (23005796398).

Almost surely, 2^91989200911 is an apocalyptic number.

91989200911 is a deficient number, since it is larger than the sum of its proper divisors (33984681).

91989200911 is a wasteful number, since it uses less digits than its factorization.

91989200911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33984680.

The product of its (nonzero) digits is 104976, while the sum is 49.

The spelling of 91989200911 in words is "ninety-one billion, nine hundred eighty-nine million, two hundred thousand, nine hundred eleven".