111131 has 4 divisors (see below), whose sum is σ = 117000. Its totient is φ = 105264.

The previous prime is 111127. The next prime is 111143. The reversal of 111131 is 131111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 111131 - 2² = 111127 is a prime.

It is a super-2 number, since 2×111131² = 24700198322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906 + ... + 2943.

It is an arithmetic number, because the mean of its divisors is an integer number (29250).

2¹¹¹¹³¹ is an apocalyptic number.

111131 is a deficient number, since it is larger than the sum of its proper divisors (5869).

111131 is an equidigital number, since it uses as much as digits as its factorization.

111131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5868.

The product of its digits is 3, while the sum is 8.

The square root of 111131 is about 333.3631653317. The cubic root of 111131 is about 48.0778539799.

Adding to 111131 its reverse (131111), we get a palindrome (242242).

It can be divided in two parts, 111 and 131, that multiplied together give a palindrome (14541).

The spelling of 111131 in words is "one hundred eleven thousand, one hundred thirty-one".