1999366489 has 2 divisors, whose sum is σ = 1999366490. Its totient is φ = 1999366488.

The previous prime is 1999366477. The next prime is 1999366493. The reversal of 1999366489 is 9846639991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1730144025 + 269222464 = 41595^2 + 16408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1999366489 - 2⁷ = 1999366361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1999366489.

It is not a weakly prime, because it can be changed into another prime (1999366429) 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, 999683244 + 999683245.

It is an arithmetic number, because the mean of its divisors is an integer number (999683245).

Almost surely, 2^1999366489 is an apocalyptic number.

It is an amenable number.

1999366489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999366489 is an equidigital number, since it uses as much as digits as its factorization.

1999366489 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22674816, while the sum is 64.

The square root of 1999366489 is about 44714.2761207201. The cubic root of 1999366489 is about 1259.7880068725.

The spelling of 1999366489 in words is "one billion, nine hundred ninety-nine million, three hundred sixty-six thousand, four hundred eighty-nine".