19605149 has 2 divisors, whose sum is σ = 19605150. Its totient is φ = 19605148.

The previous prime is 19605143. The next prime is 19605167. The reversal of 19605149 is 94150691.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19201924 + 403225 = 4382^2 + 635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19605149 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19605143) 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, 9802574 + 9802575.

It is an arithmetic number, because the mean of its divisors is an integer number (9802575).

Almost surely, 2^19605149 is an apocalyptic number.

It is an amenable number.

19605149 is a deficient number, since it is larger than the sum of its proper divisors (1).

19605149 is an equidigital number, since it uses as much as digits as its factorization.

19605149 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 19605149 is about 4427.7702063228. The cubic root of 19605149 is about 269.6435579975.

The spelling of 19605149 in words is "nineteen million, six hundred five thousand, one hundred forty-nine".