190808609 has 2 divisors, whose sum is σ = 190808610. Its totient is φ = 190808608.

The previous prime is 190808599. The next prime is 190808623. The reversal of 190808609 is 906808091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 169390225 + 21418384 = 13015^2 + 4628^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-190808609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (190808669) 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 as a sum of consecutive naturals, namely, 95404304 + 95404305.

It is an arithmetic number, because the mean of its divisors is an integer number (95404305).

Almost surely, 2^190808609 is an apocalyptic number.

It is an amenable number.

190808609 is a deficient number, since it is larger than the sum of its proper divisors (1).

190808609 is an equidigital number, since it uses as much as digits as its factorization.

190808609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 190808609 is about 13813.3489422370. The cubic root of 190808609 is about 575.7040992788.

The spelling of 190808609 in words is "one hundred ninety million, eight hundred eight thousand, six hundred nine".