91919010911 has 16 divisors (see below), whose sum is σ = 113142464064. Its totient is φ = 72719817984.

The previous prime is 91919010889. The next prime is 91919010923. The reversal of 91919010911 is 11901091919.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 91919010911 - 2⁶ = 91919010847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91919015911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 971921 + ... + 1062293.

It is an arithmetic number, because the mean of its divisors is an integer number (7071404004).

Almost surely, 2^91919010911 is an apocalyptic number.

91919010911 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

91919010911 is a deficient number, since it is larger than the sum of its proper divisors (21223453153).

91919010911 is a wasteful number, since it uses less digits than its factorization.

91919010911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101570.

The product of its (nonzero) digits is 6561, while the sum is 41.

The spelling of 91919010911 in words is "ninety-one billion, nine hundred nineteen million, ten thousand, nine hundred eleven".