1312120123231 has 2 divisors, whose sum is σ = 1312120123232. Its totient is φ = 1312120123230.

The previous prime is 1312120123211. The next prime is 1312120123261. The reversal of 1312120123231 is 1323210212131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312120123231 - 2⁷ = 1312120123103 is a prime.

It is a super-2 number, since 2×1312120123231² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312120123201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656060061615 + 656060061616.

It is an arithmetic number, because the mean of its divisors is an integer number (656060061616).

Almost surely, 2^{1312120123231} is an apocalyptic number.

1312120123231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312120123231 is an equidigital number, since it uses as much as digits as its factorization.

1312120123231 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1312120123231 its reverse (1323210212131), we get a palindrome (2635330335362).

The spelling of 1312120123231 in words is "one trillion, three hundred twelve billion, one hundred twenty million, one hundred twenty-three thousand, two hundred thirty-one".