1985504849 has 2 divisors, whose sum is σ = 1985504850. Its totient is φ = 1985504848.

The previous prime is 1985504819. The next prime is 1985504863. The reversal of 1985504849 is 9484055891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1912487824 + 73017025 = 43732^2 + 8545^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1985504849 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 1985504849.

It is not a weakly prime, because it can be changed into another prime (1985504819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992752424 + 992752425.

It is an arithmetic number, because the mean of its divisors is an integer number (992752425).

Almost surely, 2^1985504849 is an apocalyptic number.

It is an amenable number.

1985504849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985504849 is an equidigital number, since it uses as much as digits as its factorization.

1985504849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2073600, while the sum is 53.

The square root of 1985504849 is about 44559.0041293564. The cubic root of 1985504849 is about 1256.8698757972.

The spelling of 1985504849 in words is "one billion, nine hundred eighty-five million, five hundred four thousand, eight hundred forty-nine".