1641109889 has 2 divisors, whose sum is σ = 1641109890. Its totient is φ = 1641109888.

The previous prime is 1641109871. The next prime is 1641109963. The reversal of 1641109889 is 9889011461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 923673664 + 717436225 = 30392^2 + 26785^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641109889 - 2²⁴ = 1624332673 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1641109849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820554944 + 820554945.

It is an arithmetic number, because the mean of its divisors is an integer number (820554945).

Almost surely, 2^1641109889 is an apocalyptic number.

It is an amenable number.

1641109889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641109889 is an equidigital number, since it uses as much as digits as its factorization.

1641109889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 47.

The square root of 1641109889 is about 40510.6145226162. The cubic root of 1641109889 is about 1179.5396770519.

The spelling of 1641109889 in words is "one billion, six hundred forty-one million, one hundred nine thousand, eight hundred eighty-nine".