998966209 has 2 divisors, whose sum is σ = 998966210. Its totient is φ = 998966208.

The previous prime is 998966123. The next prime is 998966233. The reversal of 998966209 is 902669899.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 892814400 + 106151809 = 29880^2 + 10303^2 .

It is a cyclic number.

It is not a de Polignac number, because 998966209 - 2⁷ = 998966081 is a prime.

It is not a weakly prime, because it can be changed into another prime (998966279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499483104 + 499483105.

It is an arithmetic number, because the mean of its divisors is an integer number (499483105).

Almost surely, 2^998966209 is an apocalyptic number.

It is an amenable number.

998966209 is a deficient number, since it is larger than the sum of its proper divisors (1).

998966209 is an equidigital number, since it uses as much as digits as its factorization.

998966209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3779136, while the sum is 58.

The square root of 998966209 is about 31606.4267040740. The cubic root of 998966209 is about 999.6552841847.

The spelling of 998966209 in words is "nine hundred ninety-eight million, nine hundred sixty-six thousand, two hundred nine".