9181909091000 has 64 divisors (see below), whose sum is σ = 21698396890560. Its totient is φ = 3636399600000.

The previous prime is 9181909090961. The next prime is 9181909091011. The reversal of 9181909091000 is 1909091819.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45353996 + ... + 45555995.

It is an arithmetic number, because the mean of its divisors is an integer number (339037451415).

Almost surely, 2^{9181909091000} is an apocalyptic number.

It is an amenable number.

9181909091000 is an abundant number, since it is smaller than the sum of its proper divisors (12516487799560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9181909091000 is a wasteful number, since it uses less digits than its factorization.

9181909091000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90910113 (or 90910099 counting only the distinct ones).

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

The spelling of 9181909091000 in words is "nine trillion, one hundred eighty-one billion, nine hundred nine million, ninety-one thousand".