1949494889 has 2 divisors, whose sum is σ = 1949494890. Its totient is φ = 1949494888.

The previous prime is 1949494879. The next prime is 1949494891. The reversal of 1949494889 is 9884949491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1340145664 + 609349225 = 36608^2 + 24685^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1949494889 is a prime.

Together with 1949494891, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1949494849) 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, 974747444 + 974747445.

It is an arithmetic number, because the mean of its divisors is an integer number (974747445).

Almost surely, 2^1949494889 is an apocalyptic number.

It is an amenable number.

1949494889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1949494889 is an equidigital number, since it uses as much as digits as its factorization.

1949494889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26873856, while the sum is 65.

The square root of 1949494889 is about 44153.0847053748. The cubic root of 1949494889 is about 1249.2250960383.

The spelling of 1949494889 in words is "one billion, nine hundred forty-nine million, four hundred ninety-four thousand, eight hundred eighty-nine".