998072209 has 2 divisors, whose sum is σ = 998072210. Its totient is φ = 998072208.

The previous prime is 998072197. The next prime is 998072291. The reversal of 998072209 is 902270899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 612067600 + 386004609 = 24740^2 + 19647^2 .

It is an emirp because it is prime and its reverse (902270899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998072209 - 2⁷ = 998072081 is a prime.

It is a super-2 number, since 2×998072209² = 1992296268756279362, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (998072609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499036104 + 499036105.

It is an arithmetic number, because the mean of its divisors is an integer number (499036105).

Almost surely, 2^998072209 is an apocalyptic number.

It is an amenable number.

998072209 is a deficient number, since it is larger than the sum of its proper divisors (1).

998072209 is an equidigital number, since it uses as much as digits as its factorization.

998072209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 998072209 is about 31592.2808451685. The cubic root of 998072209 is about 999.3569896263.

The spelling of 998072209 in words is "nine hundred ninety-eight million, seventy-two thousand, two hundred nine".