1989569039 has 2 divisors, whose sum is σ = 1989569040. Its totient is φ = 1989569038.

The previous prime is 1989569017. The next prime is 1989569047. The reversal of 1989569039 is 9309659891.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1989569039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989569089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994784519 + 994784520.

It is an arithmetic number, because the mean of its divisors is an integer number (994784520).

Almost surely, 2^1989569039 is an apocalyptic number.

1989569039 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989569039 is an equidigital number, since it uses as much as digits as its factorization.

1989569039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4723920, while the sum is 59.

The square root of 1989569039 is about 44604.5854032968. The cubic root of 1989569039 is about 1257.7268663326.

The spelling of 1989569039 in words is "one billion, nine hundred eighty-nine million, five hundred sixty-nine thousand, thirty-nine".