2190609809 has 2 divisors, whose sum is σ = 2190609810. Its totient is φ = 2190609808.

The previous prime is 2190609791. The next prime is 2190609821. The reversal of 2190609809 is 9089060912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2103598225 + 87011584 = 45865^2 + 9328^2 .

It is a cyclic number.

It is not a de Polignac number, because 2190609809 - 2¹² = 2190605713 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2190609809.

It is not a weakly prime, because it can be changed into another prime (2190609829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095304904 + 1095304905.

It is an arithmetic number, because the mean of its divisors is an integer number (1095304905).

Almost surely, 2^2190609809 is an apocalyptic number.

It is an amenable number.

2190609809 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190609809 is an equidigital number, since it uses as much as digits as its factorization.

2190609809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 2190609809 is about 46803.9507840951. The cubic root of 2190609809 is about 1298.7383833273.

The spelling of 2190609809 in words is "two billion, one hundred ninety million, six hundred nine thousand, eight hundred nine".