231040213 has 2 divisors, whose sum is σ = 231040214. Its totient is φ = 231040212.

The previous prime is 231040189. The next prime is 231040223. The reversal of 231040213 is 312040132.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 230979204 + 61009 = 15198^2 + 247^2 .

It is a cyclic number.

It is not a de Polignac number, because 231040213 - 2⁵ = 231040181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231040223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115520106 + 115520107.

It is an arithmetic number, because the mean of its divisors is an integer number (115520107).

Almost surely, 2^231040213 is an apocalyptic number.

It is an amenable number.

231040213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231040213 is an equidigital number, since it uses as much as digits as its factorization.

231040213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 231040213 is about 15200.0070065773. The cubic root of 231040213 is about 613.6148463190.

Adding to 231040213 its reverse (312040132), we get a palindrome (543080345).

The spelling of 231040213 in words is "two hundred thirty-one million, forty thousand, two hundred thirteen".