9191681613 has 12 divisors (see below), whose sum is σ = 13854129120. Its totient is φ = 5861362056.

The previous prime is 9191681579. The next prime is 9191681621. The reversal of 9191681613 is 3161861919.

9191681613 is a `hidden beast` number, since 9 + 19 + 16 + 8 + 1 + 613 = 666.

It is not a de Polignac number, because 9191681613 - 2²¹ = 9189584461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9191681113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22201923 + ... + 22202336.

It is an arithmetic number, because the mean of its divisors is an integer number (1154510760).

Almost surely, 2^9191681613 is an apocalyptic number.

It is an amenable number.

9191681613 is a deficient number, since it is larger than the sum of its proper divisors (4662447507).

9191681613 is a wasteful number, since it uses less digits than its factorization.

9191681613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44404288 (or 44404285 counting only the distinct ones).

The product of its digits is 69984, while the sum is 45.

The square root of 9191681613 is about 95873.2580702252. The cubic root of 9191681613 is about 2094.7473878559.

The spelling of 9191681613 in words is "nine billion, one hundred ninety-one million, six hundred eighty-one thousand, six hundred thirteen".