1211091727513 has 2 divisors, whose sum is σ = 1211091727514. Its totient is φ = 1211091727512.

The previous prime is 1211091727481. The next prime is 1211091727523. The reversal of 1211091727513 is 3157271901121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 710778827929 + 500312899584 = 843077^2 + 707328^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211091727513 - 2⁵ = 1211091727481 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211091727523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605545863756 + 605545863757.

It is an arithmetic number, because the mean of its divisors is an integer number (605545863757).

Almost surely, 2^{1211091727513} is an apocalyptic number.

It is an amenable number.

1211091727513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211091727513 is an equidigital number, since it uses as much as digits as its factorization.

1211091727513 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26460, while the sum is 40.

The spelling of 1211091727513 in words is "one trillion, two hundred eleven billion, ninety-one million, seven hundred twenty-seven thousand, five hundred thirteen".