2191582306917 has 16 divisors (see below), whose sum is σ = 3334539647680. Its totient is φ = 1421566901136.

The previous prime is 2191582306883. The next prime is 2191582306939. The reversal of 2191582306917 is 7196032851912.

It is a happy number.

2191582306917 is a `hidden beast` number, since 2 + 19 + 1 + 582 + 30 + 6 + 9 + 17 = 666.

It is not a de Polignac number, because 2191582306917 - 2⁶ = 2191582306853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2191582306117) 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, 1096887043 + ... + 1096889040.

It is an arithmetic number, because the mean of its divisors is an integer number (208408727980).

Almost surely, 2^{2191582306917} is an apocalyptic number.

2191582306917 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

2191582306917 is a deficient number, since it is larger than the sum of its proper divisors (1142957340763).

2191582306917 is a wasteful number, since it uses less digits than its factorization.

2191582306917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2193776129 (or 2193776123 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The spelling of 2191582306917 in words is "two trillion, one hundred ninety-one billion, five hundred eighty-two million, three hundred six thousand, nine hundred seventeen".