231242240137 has 2 divisors, whose sum is σ = 231242240138. Its totient is φ = 231242240136.

The previous prime is 231242240081. The next prime is 231242240153. The reversal of 231242240137 is 731042242132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 228571004281 + 2671235856 = 478091^2 + 51684^2 .

It is a cyclic number.

It is not a de Polignac number, because 231242240137 - 2¹¹ = 231242238089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231242240099 and 231242240108.

It is not a weakly prime, because it can be changed into another prime (231242210137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115621120068 + 115621120069.

It is an arithmetic number, because the mean of its divisors is an integer number (115621120069).

Almost surely, 2^231242240137 is an apocalyptic number.

It is an amenable number.

231242240137 is a deficient number, since it is larger than the sum of its proper divisors (1).

231242240137 is an equidigital number, since it uses as much as digits as its factorization.

231242240137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16128, while the sum is 31.

Adding to 231242240137 its reverse (731042242132), we get a palindrome (962284482269).

The spelling of 231242240137 in words is "two hundred thirty-one billion, two hundred forty-two million, two hundred forty thousand, one hundred thirty-seven".