1999099589 has 2 divisors, whose sum is σ = 1999099590. Its totient is φ = 1999099588.

The previous prime is 1999099561. The next prime is 1999099637. The reversal of 1999099589 is 9859909991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1864771489 + 134328100 = 43183^2 + 11590^2 .

It is an emirp because it is prime and its reverse (9859909991) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1999099589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1999099519) 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, 999549794 + 999549795.

It is an arithmetic number, because the mean of its divisors is an integer number (999549795).

Almost surely, 2^1999099589 is an apocalyptic number.

It is an amenable number.

1999099589 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999099589 is an equidigital number, since it uses as much as digits as its factorization.

1999099589 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21257640, while the sum is 68.

The square root of 1999099589 is about 44711.2915156787. The cubic root of 1999099589 is about 1259.7319470516.

The spelling of 1999099589 in words is "one billion, nine hundred ninety-nine million, ninety-nine thousand, five hundred eighty-nine".