1312120212191 has 2 divisors, whose sum is σ = 1312120212192. Its totient is φ = 1312120212190.

The previous prime is 1312120212119. The next prime is 1312120212233. The reversal of 1312120212191 is 1912120212131.

Together with previous prime (1312120212119) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312120212191 - 2²⁶ = 1312053103327 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1312120212191.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312120292191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656060106095 + 656060106096.

It is an arithmetic number, because the mean of its divisors is an integer number (656060106096).

Almost surely, 2^{1312120212191} is an apocalyptic number.

1312120212191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312120212191 is an equidigital number, since it uses as much as digits as its factorization.

1312120212191 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 26.

The spelling of 1312120212191 in words is "one trillion, three hundred twelve billion, one hundred twenty million, two hundred twelve thousand, one hundred ninety-one".