231243121237 has 2 divisors, whose sum is σ = 231243121238. Its totient is φ = 231243121236.

The previous prime is 231243121171. The next prime is 231243121259. The reversal of 231243121237 is 732121342132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 223654272241 + 7588848996 = 472921^2 + 87114^2 .

It is a cyclic number.

It is not a de Polignac number, because 231243121237 - 2³⁵ = 196883382869 is a prime.

It is a super-2 number, since 2×231243121237² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231243121199 and 231243121208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231243121037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115621560618 + 115621560619.

It is an arithmetic number, because the mean of its divisors is an integer number (115621560619).

Almost surely, 2^231243121237 is an apocalyptic number.

It is an amenable number.

231243121237 is a deficient number, since it is larger than the sum of its proper divisors (1).

231243121237 is an equidigital number, since it uses as much as digits as its factorization.

231243121237 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

Adding to 231243121237 its reverse (732121342132), we get a palindrome (963364463369).

The spelling of 231243121237 in words is "two hundred thirty-one billion, two hundred forty-three million, one hundred twenty-one thousand, two hundred thirty-seven".