9181909181920 has 24 divisors (see below), whose sum is σ = 21692260442664. Its totient is φ = 3672763672704.

The previous prime is 9181909181909. The next prime is 9181909181927. The reversal of 9181909181920 is 291819091819.

9181909181920 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9181909181927) 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, 28693466034 + ... + 28693466353.

It is an arithmetic number, because the mean of its divisors is an integer number (903844185111).

Almost surely, 2^{9181909181920} is an apocalyptic number.

It is an amenable number.

9181909181920 is an abundant number, since it is smaller than the sum of its proper divisors (12510351260744).

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

9181909181920 is a wasteful number, since it uses less digits than its factorization.

9181909181920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57386932402 (or 57386932394 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 58.

The spelling of 9181909181920 in words is "nine trillion, one hundred eighty-one billion, nine hundred nine million, one hundred eighty-one thousand, nine hundred twenty".