1985548489 has 2 divisors, whose sum is σ = 1985548490. Its totient is φ = 1985548488.

The previous prime is 1985548459. The next prime is 1985548547. The reversal of 1985548489 is 9848455891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1897038025 + 88510464 = 43555^2 + 9408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1985548489 - 2⁷ = 1985548361 is a prime.

It is not a weakly prime, because it can be changed into another prime (1985548459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992774244 + 992774245.

It is an arithmetic number, because the mean of its divisors is an integer number (992774245).

Almost surely, 2^1985548489 is an apocalyptic number.

It is an amenable number.

1985548489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1985548489 is an equidigital number, since it uses as much as digits as its factorization.

1985548489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16588800, while the sum is 61.

The square root of 1985548489 is about 44559.4938144499. The cubic root of 1985548489 is about 1256.8790841017.

The spelling of 1985548489 in words is "one billion, nine hundred eighty-five million, five hundred forty-eight thousand, four hundred eighty-nine".