998555211 has 12 divisors (see below), whose sum is σ = 1442646088. Its totient is φ = 665570304.

The previous prime is 998555183. The next prime is 998555221. The reversal of 998555211 is 112555899.

998555211 is a `hidden beast` number, since 9 + 9 + 85 + 552 + 11 = 666.

It is not a de Polignac number, because 998555211 - 2⁷ = 998555083 is a prime.

It is a super-2 number, since 2×998555211² = 1994225018830509042, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (998555221) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61131 + ... + 75723.

Almost surely, 2^998555211 is an apocalyptic number.

998555211 is a deficient number, since it is larger than the sum of its proper divisors (444090877).

998555211 is a wasteful number, since it uses less digits than its factorization.

998555211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22202 (or 22199 counting only the distinct ones).

The product of its digits is 162000, while the sum is 45.

The square root of 998555211 is about 31599.9242245927. The cubic root of 998555211 is about 999.5181715453.

The spelling of 998555211 in words is "nine hundred ninety-eight million, five hundred fifty-five thousand, two hundred eleven".