91090008889 has 16 divisors (see below), whose sum is σ = 107201491200. Its totient is φ = 76467439360.

The previous prime is 91090008827. The next prime is 91090008899. The reversal of 91090008889 is 98880009019.

It is a cyclic number.

It is not a de Polignac number, because 91090008889 - 2⁷ = 91090008761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91090008899) 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, 4585489 + ... + 4605310.

It is an arithmetic number, because the mean of its divisors is an integer number (6700093200).

Almost surely, 2^91090008889 is an apocalyptic number.

It is an amenable number.

91090008889 is a deficient number, since it is larger than the sum of its proper divisors (16111482311).

91090008889 is a wasteful number, since it uses less digits than its factorization.

91090008889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9190880.

The product of its (nonzero) digits is 373248, while the sum is 52.

The spelling of 91090008889 in words is "ninety-one billion, ninety million, eight thousand, eight hundred eighty-nine".