1949316409 has 2 divisors, whose sum is σ = 1949316410. Its totient is φ = 1949316408.

The previous prime is 1949316353. The next prime is 1949316443. The reversal of 1949316409 is 9046139491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1931338809 + 17977600 = 43947^2 + 4240^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949316409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1949310409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974658204 + 974658205.

It is an arithmetic number, because the mean of its divisors is an integer number (974658205).

Almost surely, 2^1949316409 is an apocalyptic number.

It is an amenable number.

1949316409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949316409 is an equidigital number, since it uses as much as digits as its factorization.

1949316409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 1949316409 is about 44151.0635092746. The cubic root of 1949316409 is about 1249.1869718896.

The spelling of 1949316409 in words is "one billion, nine hundred forty-nine million, three hundred sixteen thousand, four hundred nine".