1989831869 has 2 divisors, whose sum is σ = 1989831870. Its totient is φ = 1989831868.

The previous prime is 1989831847. The next prime is 1989831889. The reversal of 1989831869 is 9681389891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1941459844 + 48372025 = 44062^2 + 6955^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989831869 - 2²⁴ = 1973054653 is a prime.

It is a super-2 number, since 2×1989831869² = 7918861733776066322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989831889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994915934 + 994915935.

It is an arithmetic number, because the mean of its divisors is an integer number (994915935).

Almost surely, 2^1989831869 is an apocalyptic number.

It is an amenable number.

1989831869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989831869 is an equidigital number, since it uses as much as digits as its factorization.

1989831869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6718464, while the sum is 62.

The square root of 1989831869 is about 44607.5315277589. The cubic root of 1989831869 is about 1257.7822474713.

The spelling of 1989831869 in words is "one billion, nine hundred eighty-nine million, eight hundred thirty-one thousand, eight hundred sixty-nine".