1949904409 has 2 divisors, whose sum is σ = 1949904410. Its totient is φ = 1949904408.

The previous prime is 1949904401. The next prime is 1949904413. The reversal of 1949904409 is 9044099491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1640250000 + 309654409 = 40500^2 + 17597^2 .

It is a cyclic number.

It is not a de Polignac number, because 1949904409 - 2³ = 1949904401 is a prime.

It is not a weakly prime, because it can be changed into another prime (1949904401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 974952204 + 974952205.

It is an arithmetic number, because the mean of its divisors is an integer number (974952205).

Almost surely, 2^1949904409 is an apocalyptic number.

It is an amenable number.

1949904409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949904409 is an equidigital number, since it uses as much as digits as its factorization.

1949904409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 1949904409 is about 44157.7219634347. The cubic root of 1949904409 is about 1249.3125625998.

The spelling of 1949904409 in words is "one billion, nine hundred forty-nine million, nine hundred four thousand, four hundred nine".