91009101000899 has 4 divisors (see below), whose sum is σ = 91009130621136. Its totient is φ = 91009071380664.

The previous prime is 91009101000863. The next prime is 91009101000911. The reversal of 91009101000899 is 99800010190019.

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 91009101000899 - 2³⁶ = 90940381524163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91009101000859) 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, 9587399 + ... + 16551024.

It is an arithmetic number, because the mean of its divisors is an integer number (22752282655284).

Almost surely, 2^{91009101000899} is an apocalyptic number.

91009101000899 is a deficient number, since it is larger than the sum of its proper divisors (29620237).

91009101000899 is a wasteful number, since it uses less digits than its factorization.

91009101000899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29620236.

The product of its (nonzero) digits is 52488, while the sum is 47.

The spelling of 91009101000899 in words is "ninety-one trillion, nine billion, one hundred one million, eight hundred ninety-nine", and thus it is an aban number.