111611131 has 2 divisors, whose sum is σ = 111611132. Its totient is φ = 111611130.

The previous prime is 111611113. The next prime is 111611141. The reversal of 111611131 is 131116111.

Together with previous prime (111611113) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 111611131 - 2⁵ = 111611099 is a prime.

It is a super-2 number, since 2×111611131² = 24914089126198322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111611141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55805565 + 55805566.

It is an arithmetic number, because the mean of its divisors is an integer number (55805566).

Almost surely, 2^111611131 is an apocalyptic number.

111611131 is a deficient number, since it is larger than the sum of its proper divisors (1).

111611131 is an equidigital number, since it uses as much as digits as its factorization.

111611131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18, while the sum is 16.

The square root of 111611131 is about 10564.6169357909. The cubic root of 111611131 is about 481.4699311623.

Adding to 111611131 its reverse (131116111), we get a palindrome (242727242).

The spelling of 111611131 in words is "one hundred eleven million, six hundred eleven thousand, one hundred thirty-one".