1889985541 has 2 divisors, whose sum is σ = 1889985542. Its totient is φ = 1889985540.

The previous prime is 1889985533. The next prime is 1889985563. The reversal of 1889985541 is 1455899881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1774852641 + 115132900 = 42129^2 + 10730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889985541 - 2³ = 1889985533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1889985511) 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, 944992770 + 944992771.

It is an arithmetic number, because the mean of its divisors is an integer number (944992771).

Almost surely, 2^1889985541 is an apocalyptic number.

It is an amenable number.

1889985541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889985541 is an equidigital number, since it uses as much as digits as its factorization.

1889985541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4147200, while the sum is 58.

The square root of 1889985541 is about 43473.9639439516. The cubic root of 1889985541 is about 1236.3824370422.

The spelling of 1889985541 in words is "one billion, eight hundred eighty-nine million, nine hundred eighty-five thousand, five hundred forty-one".