1941489809 has 6 divisors (see below), whose sum is σ = 2258467794. Its totient is φ = 1664134080.

The previous prime is 1941489791. The next prime is 1941489829. The reversal of 1941489809 is 9089841491.

It can be written as a sum of positive squares in only one way, i.e., 1272491584 + 668998225 = 35672^2 + 25865^2 .

It is not a de Polignac number, because 1941489809 - 2⁸ = 1941489553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1941489829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19811072 + ... + 19811169.

It is an arithmetic number, because the mean of its divisors is an integer number (376411299).

Almost surely, 2^1941489809 is an apocalyptic number.

It is an amenable number.

1941489809 is a deficient number, since it is larger than the sum of its proper divisors (316977985).

1941489809 is an equidigital number, since it uses as much as digits as its factorization.

1941489809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39622255 (or 39622248 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 53.

The square root of 1941489809 is about 44062.3400309153. The cubic root of 1941489809 is about 1247.5128805917.

The spelling of 1941489809 in words is "one billion, nine hundred forty-one million, four hundred eighty-nine thousand, eight hundred nine".