2191046917 has 2 divisors, whose sum is σ = 2191046918. Its totient is φ = 2191046916.

The previous prime is 2191046911. The next prime is 2191046933. The reversal of 2191046917 is 7196401912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2141005441 + 50041476 = 46271^2 + 7074^2 .

It is a cyclic number.

It is not a de Polignac number, because 2191046917 - 2⁷ = 2191046789 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2191046917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2191046911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095523458 + 1095523459.

It is an arithmetic number, because the mean of its divisors is an integer number (1095523459).

Almost surely, 2^2191046917 is an apocalyptic number.

It is an amenable number.

2191046917 is a deficient number, since it is larger than the sum of its proper divisors (1).

2191046917 is an equidigital number, since it uses as much as digits as its factorization.

2191046917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 2191046917 is about 46808.6201142482. The cubic root of 2191046917 is about 1298.8247597601.

The spelling of 2191046917 in words is "two billion, one hundred ninety-one million, forty-six thousand, nine hundred seventeen".