231222222137 has 2 divisors, whose sum is σ = 231222222138. Its totient is φ = 231222222136.

The previous prime is 231222222107. The next prime is 231222222149. The reversal of 231222222137 is 731222222132.

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., 228901006096 + 2321216041 = 478436^2 + 48179^2 .

It is a cyclic number.

It is not a de Polignac number, because 231222222137 - 2³⁶ = 162502745401 is a prime.

It is not a weakly prime, because it can be changed into another prime (231222222107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115611111068 + 115611111069.

It is an arithmetic number, because the mean of its divisors is an integer number (115611111069).

Almost surely, 2^231222222137 is an apocalyptic number.

It is an amenable number.

231222222137 is a deficient number, since it is larger than the sum of its proper divisors (1).

231222222137 is an equidigital number, since it uses as much as digits as its factorization.

231222222137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 29.

Adding to 231222222137 its reverse (731222222132), we get a palindrome (962444444269).

The spelling of 231222222137 in words is "two hundred thirty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, one hundred thirty-seven".