499997189 has 2 divisors, whose sum is σ = 499997190. Its totient is φ = 499997188.

The previous prime is 499997143. The next prime is 499997203. The reversal of 499997189 is 981799994.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 481144225 + 18852964 = 21935^2 + 4342^2 .

It is a cyclic number.

It is not a de Polignac number, because 499997189 - 2⁸ = 499996933 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (499997119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249998594 + 249998595.

It is an arithmetic number, because the mean of its divisors is an integer number (249998595).

Almost surely, 2^499997189 is an apocalyptic number.

It is an amenable number.

499997189 is a deficient number, since it is larger than the sum of its proper divisors (1).

499997189 is an equidigital number, since it uses as much as digits as its factorization.

499997189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 65.

The square root of 499997189 is about 22360.6169190387. The cubic root of 499997189 is about 793.6990385865.

The spelling of 499997189 in words is "four hundred ninety-nine million, nine hundred ninety-seven thousand, one hundred eighty-nine".