231543401213 has 2 divisors, whose sum is σ = 231543401214. Its totient is φ = 231543401212.

The previous prime is 231543401093. The next prime is 231543401237. The reversal of 231543401213 is 312104345132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 183237075844 + 48306325369 = 428062^2 + 219787^2 .

It is a cyclic number.

It is not a de Polignac number, because 231543401213 - 2¹⁶ = 231543335677 is a prime.

It is a super-2 number, since 2×231543401213² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231543401263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115771700606 + 115771700607.

It is an arithmetic number, because the mean of its divisors is an integer number (115771700607).

Almost surely, 2^231543401213 is an apocalyptic number.

It is an amenable number.

231543401213 is a deficient number, since it is larger than the sum of its proper divisors (1).

231543401213 is an equidigital number, since it uses as much as digits as its factorization.

231543401213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 231543401213 its reverse (312104345132), we get a palindrome (543647746345).

The spelling of 231543401213 in words is "two hundred thirty-one billion, five hundred forty-three million, four hundred one thousand, two hundred thirteen".