1312100123231 has 2 divisors, whose sum is σ = 1312100123232. Its totient is φ = 1312100123230.

The previous prime is 1312100123227. The next prime is 1312100123251. The reversal of 1312100123231 is 1323210012131.

It is a happy number.

It is an a-pointer prime, because the next prime (1312100123251) can be obtained adding 1312100123231 to its sum of digits (20).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1312100123231 - 2² = 1312100123227 is a prime.

It is a super-2 number, since 2×1312100123231² (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 (1312100123251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656050061615 + 656050061616.

It is an arithmetic number, because the mean of its divisors is an integer number (656050061616).

Almost surely, 2^{1312100123231} is an apocalyptic number.

1312100123231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312100123231 is an equidigital number, since it uses as much as digits as its factorization.

1312100123231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 1312100123231 its reverse (1323210012131), we get a palindrome (2635310135362).

The spelling of 1312100123231 in words is "one trillion, three hundred twelve billion, one hundred million, one hundred twenty-three thousand, two hundred thirty-one".