998866213 has 2 divisors, whose sum is σ = 998866214. Its totient is φ = 998866212.

The previous prime is 998866201. The next prime is 998866261. The reversal of 998866213 is 312668899.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 506115009 + 492751204 = 22497^2 + 22198^2 .

It is an emirp because it is prime and its reverse (312668899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998866213 - 2²¹ = 996769061 is a prime.

It is a super-2 number, since 2×998866213² = 1995467422945922738, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998866013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499433106 + 499433107.

It is an arithmetic number, because the mean of its divisors is an integer number (499433107).

Almost surely, 2^998866213 is an apocalyptic number.

It is an amenable number.

998866213 is a deficient number, since it is larger than the sum of its proper divisors (1).

998866213 is an equidigital number, since it uses as much as digits as its factorization.

998866213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 52.

The square root of 998866213 is about 31604.8447710157. The cubic root of 998866213 is about 999.6219280796.

The spelling of 998866213 in words is "nine hundred ninety-eight million, eight hundred sixty-six thousand, two hundred thirteen".