2109813197 has 2 divisors, whose sum is σ = 2109813198. Its totient is φ = 2109813196.

The previous prime is 2109813187. The next prime is 2109813217. The reversal of 2109813197 is 7913189012.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1327436356 + 782376841 = 36434^2 + 27971^2 .

It is a cyclic number.

It is not a de Polignac number, because 2109813197 - 2⁸ = 2109812941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2109813187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1054906598 + 1054906599.

It is an arithmetic number, because the mean of its divisors is an integer number (1054906599).

Almost surely, 2^2109813197 is an apocalyptic number.

It is an amenable number.

2109813197 is a deficient number, since it is larger than the sum of its proper divisors (1).

2109813197 is an equidigital number, since it uses as much as digits as its factorization.

2109813197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 41.

The square root of 2109813197 is about 45932.7029141547. The cubic root of 2109813197 is about 1282.5707605349.

The spelling of 2109813197 in words is "two billion, one hundred nine million, eight hundred thirteen thousand, one hundred ninety-seven".