111311131 has 2 divisors, whose sum is σ = 111311132. Its totient is φ = 111311130.

The previous prime is 111311029. The next prime is 111311147. The reversal of 111311131 is 131113111.

It is a strong prime.

It is an emirp because it is prime and its reverse (131113111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 111311131 - 2⁷ = 111311003 is a prime.

It is a super-2 number, since 2×111311131² = 24780335768998322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (111311231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55655565 + 55655566.

It is an arithmetic number, because the mean of its divisors is an integer number (55655566).

Almost surely, 2^111311131 is an apocalyptic number.

111311131 is a deficient number, since it is larger than the sum of its proper divisors (1).

111311131 is an equidigital number, since it uses as much as digits as its factorization.

111311131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9, while the sum is 13.

The square root of 111311131 is about 10550.4090442030. The cubic root of 111311131 is about 481.0381624365.

Adding to 111311131 its reverse (131113111), we get a palindrome (242424242).

It can be divided in two parts, 11 and 1311131, that multiplied together give a palindrome (14422441).

The spelling of 111311131 in words is "one hundred eleven million, three hundred eleven thousand, one hundred thirty-one".