111131213 has 2 divisors, whose sum is σ = 111131214. Its totient is φ = 111131212.

The previous prime is 111131201. The next prime is 111131231. The reversal of 111131213 is 312131111.

It is a happy number.

Together with next prime (111131231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a m-pointer prime, because the next prime (111131231) can be obtained adding 111131213 to its product of digits (18).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105308644 + 5822569 = 10262^2 + 2413^2 .

It is a cyclic number.

It is not a de Polignac number, because 111131213 - 2⁶ = 111131149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (111131233) 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, 55565606 + 55565607.

It is an arithmetic number, because the mean of its divisors is an integer number (55565607).

Almost surely, 2^111131213 is an apocalyptic number.

It is an amenable number.

111131213 is a deficient number, since it is larger than the sum of its proper divisors (1).

111131213 is an equidigital number, since it uses as much as digits as its factorization.

111131213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18, while the sum is 14.

The square root of 111131213 is about 10541.8790070841. The cubic root of 111131213 is about 480.7788469615.

Adding to 111131213 its reverse (312131111), we get a palindrome (423262324).

It can be divided in two parts, 1111 and 31213, that multiplied together give a palindrome (34677643).

The spelling of 111131213 in words is "one hundred eleven million, one hundred thirty-one thousand, two hundred thirteen".