998556111 has 48 divisors (see below), whose sum is σ = 1698537984. Its totient is φ = 553355712.

The previous prime is 998556089. The next prime is 998556113. The reversal of 998556111 is 111655899.

998556111 is a `hidden beast` number, since 9 + 9 + 85 + 561 + 1 + 1 = 666.

It is not a de Polignac number, because 998556111 - 2⁵ = 998556079 is a prime.

It is a super-2 number, since 2×998556111² = 1994228613630888642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (998556113) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1032150 + ... + 1033116.

It is an arithmetic number, because the mean of its divisors is an integer number (35386208).

Almost surely, 2^998556111 is an apocalyptic number.

998556111 is a deficient number, since it is larger than the sum of its proper divisors (699981873).

998556111 is a wasteful number, since it uses less digits than its factorization.

998556111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1457 counting only the distinct ones).

The product of its digits is 97200, while the sum is 45.

The square root of 998556111 is about 31599.9384651300. The cubic root of 998556111 is about 999.5184718345.

The spelling of 998556111 in words is "nine hundred ninety-eight million, five hundred fifty-six thousand, one hundred eleven".