1909163497 has 2 divisors, whose sum is σ = 1909163498. Its totient is φ = 1909163496.

The previous prime is 1909163447. The next prime is 1909163513. The reversal of 1909163497 is 7943619091.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1575772416 + 333391081 = 39696^2 + 18259^2 .

It is an emirp because it is prime and its reverse (7943619091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1909163497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1909163497.

It is not a weakly prime, because it can be changed into another prime (1909163447) 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, 954581748 + 954581749.

It is an arithmetic number, because the mean of its divisors is an integer number (954581749).

Almost surely, 2^1909163497 is an apocalyptic number.

It is an amenable number.

1909163497 is a deficient number, since it is larger than the sum of its proper divisors (1).

1909163497 is an equidigital number, since it uses as much as digits as its factorization.

1909163497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 1909163497 is about 43693.9755229482. The cubic root of 1909163497 is about 1240.5502884046.

The spelling of 1909163497 in words is "one billion, nine hundred nine million, one hundred sixty-three thousand, four hundred ninety-seven".