2191205913 has 32 divisors (see below), whose sum is σ = 3318403200. Its totient is φ = 1274973696.

The previous prime is 2191205909. The next prime is 2191205921. The reversal of 2191205913 is 3195021912.

It is not a de Polignac number, because 2191205913 - 2² = 2191205909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2191205993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 419031 + ... + 424227.

It is an arithmetic number, because the mean of its divisors is an integer number (103700100).

Almost surely, 2^2191205913 is an apocalyptic number.

It is an amenable number.

2191205913 is a deficient number, since it is larger than the sum of its proper divisors (1127197287).

2191205913 is a wasteful number, since it uses less digits than its factorization.

2191205913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801.

The product of its (nonzero) digits is 4860, while the sum is 33.

The square root of 2191205913 is about 46810.3184458299. The cubic root of 2191205913 is about 1298.8561759361.

The spelling of 2191205913 in words is "two billion, one hundred ninety-one million, two hundred five thousand, nine hundred thirteen".