998555549 has 2 divisors, whose sum is σ = 998555550. Its totient is φ = 998555548.

The previous prime is 998555531. The next prime is 998555581. The reversal of 998555549 is 945555899.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 945993049 + 52562500 = 30757^2 + 7250^2 .

It is a cyclic number.

It is not a de Polignac number, because 998555549 - 2⁸ = 998555293 is a prime.

It is a super-2 number, since 2×998555549² = 1994226368877382802, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (998558549) 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, 499277774 + 499277775.

It is an arithmetic number, because the mean of its divisors is an integer number (499277775).

Almost surely, 2^998555549 is an apocalyptic number.

It is an amenable number.

998555549 is a deficient number, since it is larger than the sum of its proper divisors (1).

998555549 is an equidigital number, since it uses as much as digits as its factorization.

998555549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14580000, while the sum is 59.

The square root of 998555549 is about 31599.9295727063. The cubic root of 998555549 is about 999.5182843206.

The spelling of 998555549 in words is "nine hundred ninety-eight million, five hundred fifty-five thousand, five hundred forty-nine".