1231012312331 has 2 divisors, whose sum is σ = 1231012312332. Its totient is φ = 1231012312330.

The previous prime is 1231012312289. The next prime is 1231012312333. The reversal of 1231012312331 is 1332132101321.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1231012312331 - 2¹⁰ = 1231012311307 is a prime.

It is a super-2 number, since 2×1231012312331² (a number of 25 digits) contains 22 as substring.

Together with 1231012312333, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1231012312297 and 1231012312306.

It is not a weakly prime, because it can be changed into another prime (1231012312333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615506156165 + 615506156166.

It is an arithmetic number, because the mean of its divisors is an integer number (615506156166).

Almost surely, 2^{1231012312331} is an apocalyptic number.

1231012312331 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231012312331 is an equidigital number, since it uses as much as digits as its factorization.

1231012312331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1231012312331 its reverse (1332132101321), we get a palindrome (2563144413652).

The spelling of 1231012312331 in words is "one trillion, two hundred thirty-one billion, twelve million, three hundred twelve thousand, three hundred thirty-one".