231213113 has 2 divisors, whose sum is σ = 231213114. Its totient is φ = 231213112.

The previous prime is 231213077. The next prime is 231213127. The reversal of 231213113 is 311312132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119530489 + 111682624 = 10933^2 + 10568^2 .

It is a cyclic number.

It is not a de Polignac number, because 231213113 - 2⁶ = 231213049 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231213091 and 231213100.

It is not a weakly prime, because it can be changed into another prime (231216113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115606556 + 115606557.

It is an arithmetic number, because the mean of its divisors is an integer number (115606557).

Almost surely, 2^231213113 is an apocalyptic number.

It is an amenable number.

231213113 is a deficient number, since it is larger than the sum of its proper divisors (1).

231213113 is an equidigital number, since it uses as much as digits as its factorization.

231213113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108, while the sum is 17.

The square root of 231213113 is about 15205.6934402874. The cubic root of 231213113 is about 613.7678753109.

Adding to 231213113 its reverse (311312132), we get a palindrome (542525245).

The spelling of 231213113 in words is "two hundred thirty-one million, two hundred thirteen thousand, one hundred thirteen".