1211205826697 has 2 divisors, whose sum is σ = 1211205826698. Its totient is φ = 1211205826696.

The previous prime is 1211205826687. The next prime is 1211205826739. The reversal of 1211205826697 is 7966285021121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 797340057721 + 413865768976 = 892939^2 + 643324^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211205826697 - 2³⁰ = 1210132084873 is a prime.

It is not a weakly prime, because it can be changed into another prime (1211205826627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605602913348 + 605602913349.

It is an arithmetic number, because the mean of its divisors is an integer number (605602913349).

Almost surely, 2^{1211205826697} is an apocalyptic number.

It is an amenable number.

1211205826697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211205826697 is an equidigital number, since it uses as much as digits as its factorization.

1211205826697 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 1211205826697 in words is "one trillion, two hundred eleven billion, two hundred five million, eight hundred twenty-six thousand, six hundred ninety-seven".