1989448141 has 2 divisors, whose sum is σ = 1989448142. Its totient is φ = 1989448140.

The previous prime is 1989448133. The next prime is 1989448147. The reversal of 1989448141 is 1418449891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1987287241 + 2160900 = 44579^2 + 1470^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989448141 - 2³ = 1989448133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989448147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994724070 + 994724071.

It is an arithmetic number, because the mean of its divisors is an integer number (994724071).

Almost surely, 2^1989448141 is an apocalyptic number.

It is an amenable number.

1989448141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989448141 is an equidigital number, since it uses as much as digits as its factorization.

1989448141 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 49.

The square root of 1989448141 is about 44603.2301632965. The cubic root of 1989448141 is about 1257.7013901717.

The spelling of 1989448141 in words is "one billion, nine hundred eighty-nine million, four hundred forty-eight thousand, one hundred forty-one".