9091910009091 has 48 divisors (see below), whose sum is σ = 15596932765344. Its totient is φ = 4666118317056.

The previous prime is 9091910009089. The next prime is 9091910009129. The reversal of 9091910009091 is 1909000191909.

It is not a de Polignac number, because 9091910009091 - 2¹ = 9091910009089 is a prime.

It is a super-2 number, since 2×9091910009091² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9091910009091.

It is not an unprimeable number, because it can be changed into a prime (9091910009041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64222150 + ... + 64363563.

It is an arithmetic number, because the mean of its divisors is an integer number (324936099278).

Almost surely, 2^{9091910009091} is an apocalyptic number.

9091910009091 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

9091910009091 is a deficient number, since it is larger than the sum of its proper divisors (6505022756253).

9091910009091 is a wasteful number, since it uses less digits than its factorization.

9091910009091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128585780 (or 128585773 counting only the distinct ones).

The product of its (nonzero) digits is 59049, while the sum is 48.

The spelling of 9091910009091 in words is "nine trillion, ninety-one billion, nine hundred ten million, nine thousand, ninety-one".