9191091979440 has 120 divisors (see below), whose sum is σ = 35276286378528. Its totient is φ = 2100821022720.

The previous prime is 9191091979379. The next prime is 9191091979499. The reversal of 9191091979440 is 449791901919.

9191091979440 is a `hidden beast` number, since 9 + 1 + 9 + 10 + 91 + 97 + 9 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 911809641 + ... + 911819720.

Almost surely, 2^{9191091979440} is an apocalyptic number.

9191091979440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

9191091979440 is an abundant number, since it is smaller than the sum of its proper divisors (26085194399088).

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

9191091979440 is a wasteful number, since it uses less digits than its factorization.

9191091979440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1823629387 (or 1823629378 counting only the distinct ones).

The product of its (nonzero) digits is 6613488, while the sum is 63.

The spelling of 9191091979440 in words is "nine trillion, one hundred ninety-one billion, ninety-one million, nine hundred seventy-nine thousand, four hundred forty".