1198111111 has 2 divisors, whose sum is σ = 1198111112. Its totient is φ = 1198111110.

The previous prime is 1198111093. The next prime is 1198111121. The reversal of 1198111111 is 1111118911.

It is a strong prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1111118611 and 1168111111.

It is a cyclic number.

It is not a de Polignac number, because 1198111111 - 2¹¹ = 1198109063 is a prime.

1198111111 is a modest number, since divided by 111111 gives 1198 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1198111121) 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, 599055555 + 599055556.

It is an arithmetic number, because the mean of its divisors is an integer number (599055556).

Almost surely, 2^1198111111 is an apocalyptic number.

1198111111 is a deficient number, since it is larger than the sum of its proper divisors (1).

1198111111 is an equidigital number, since it uses as much as digits as its factorization.

1198111111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72, while the sum is 25.

The square root of 1198111111 is about 34613.7416498130. The cubic root of 1198111111 is about 1062.1007085749.

The spelling of 1198111111 in words is "one billion, one hundred ninety-eight million, one hundred eleven thousand, one hundred eleven".