111243213 has 14 divisors (see below), whose sum is σ = 166789614. Its totient is φ = 74161656.

The previous prime is 111243191. The next prime is 111243241. The reversal of 111243213 is 312342111.

It can be written as a sum of positive squares in only one way, i.e., 93954249 + 17288964 = 9693^2 + 4158^2 .

It is not a de Polignac number, because 111243213 - 2¹⁸ = 110981069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111243263) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 75570 + ... + 77027.

Almost surely, 2^111243213 is an apocalyptic number.

It is an amenable number.

111243213 is a deficient number, since it is larger than the sum of its proper divisors (55546401).

111243213 is an frugal number, since it uses more digits than its factorization.

111243213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152615 (or 152600 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 111243213 is about 10547.1898153015. The cubic root of 111243213 is about 480.9403052058.

Adding to 111243213 its reverse (312342111), we get a palindrome (423585324).

The spelling of 111243213 in words is "one hundred eleven million, two hundred forty-three thousand, two hundred thirteen".