1903489649 has 2 divisors, whose sum is σ = 1903489650. Its totient is φ = 1903489648.

The previous prime is 1903489639. The next prime is 1903489663. The reversal of 1903489649 is 9469843091.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1812630625 + 90859024 = 42575^2 + 9532^2 .

It is an emirp because it is prime and its reverse (9469843091) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1903489649 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1903489649.

It is not a weakly prime, because it can be changed into another prime (1903489619) 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, 951744824 + 951744825.

It is an arithmetic number, because the mean of its divisors is an integer number (951744825).

Almost surely, 2^1903489649 is an apocalyptic number.

It is an amenable number.

1903489649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1903489649 is an equidigital number, since it uses as much as digits as its factorization.

1903489649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1679616, while the sum is 53.

The square root of 1903489649 is about 43629.0000916821. Note that the first 4 decimals coincide. The cubic root of 1903489649 is about 1239.3201374179.

The spelling of 1903489649 in words is "one billion, nine hundred three million, four hundred eighty-nine thousand, six hundred forty-nine".