1311200921291 has 2 divisors, whose sum is σ = 1311200921292. Its totient is φ = 1311200921290.

The previous prime is 1311200921273. The next prime is 1311200921297. The reversal of 1311200921291 is 1921290021131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1311200921291 - 2¹⁴ = 1311200904907 is a prime.

It is not a weakly prime, because it can be changed into another prime (1311200921297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655600460645 + 655600460646.

It is an arithmetic number, because the mean of its divisors is an integer number (655600460646).

Almost surely, 2^{1311200921291} is an apocalyptic number.

1311200921291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311200921291 is an equidigital number, since it uses as much as digits as its factorization.

1311200921291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 32.

The spelling of 1311200921291 in words is "one trillion, three hundred eleven billion, two hundred million, nine hundred twenty-one thousand, two hundred ninety-one".