998555513 has 2 divisors, whose sum is σ = 998555514. Its totient is φ = 998555512.

The previous prime is 998555479. The next prime is 998555531. The reversal of 998555513 is 315555899.

Together with next prime (998555531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 948824809 + 49730704 = 30803^2 + 7052^2 .

It is an emirp because it is prime and its reverse (315555899) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 998555513 - 2²⁴ = 981778297 is a prime.

It is a super-2 number, since 2×998555513² = 1994226225085386338, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (998555113) 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, 499277756 + 499277757.

It is an arithmetic number, because the mean of its divisors is an integer number (499277757).

Almost surely, 2^998555513 is an apocalyptic number.

It is an amenable number.

998555513 is a deficient number, since it is larger than the sum of its proper divisors (1).

998555513 is an equidigital number, since it uses as much as digits as its factorization.

998555513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1215000, while the sum is 50.

The square root of 998555513 is about 31599.9290030848. The cubic root of 998555513 is about 999.5182723090.

The spelling of 998555513 in words is "nine hundred ninety-eight million, five hundred fifty-five thousand, five hundred thirteen".