2196691909 has 2 divisors, whose sum is σ = 2196691910. Its totient is φ = 2196691908.

The previous prime is 2196691883. The next prime is 2196691919. The reversal of 2196691909 is 9091966912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1930284225 + 266407684 = 43935^2 + 16322^2 .

It is a cyclic number.

It is not a de Polignac number, because 2196691909 - 2⁵ = 2196691877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2196691919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1098345954 + 1098345955.

It is an arithmetic number, because the mean of its divisors is an integer number (1098345955).

Almost surely, 2^2196691909 is an apocalyptic number.

It is an amenable number.

2196691909 is a deficient number, since it is larger than the sum of its proper divisors (1).

2196691909 is an equidigital number, since it uses as much as digits as its factorization.

2196691909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 52.

The square root of 2196691909 is about 46868.8799631483. The cubic root of 2196691909 is about 1299.9392297036.

The spelling of 2196691909 in words is "two billion, one hundred ninety-six million, six hundred ninety-one thousand, nine hundred nine".