231112213 has 2 divisors, whose sum is σ = 231112214. Its totient is φ = 231112212.

The previous prime is 231112199. The next prime is 231112237. The reversal of 231112213 is 312211132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 230341329 + 770884 = 15177^2 + 878^2 .

It is a cyclic number.

It is not a de Polignac number, because 231112213 - 2¹³ = 231104021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231112243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115556106 + 115556107.

It is an arithmetic number, because the mean of its divisors is an integer number (115556107).

Almost surely, 2^231112213 is an apocalyptic number.

It is an amenable number.

231112213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231112213 is an equidigital number, since it uses as much as digits as its factorization.

231112213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72, while the sum is 16.

The square root of 231112213 is about 15202.3752420469. The cubic root of 231112213 is about 613.6785807945.

Adding to 231112213 its reverse (312211132), we get a palindrome (543323345).

The spelling of 231112213 in words is "two hundred thirty-one million, one hundred twelve thousand, two hundred thirteen".