1211941685597 has 2 divisors, whose sum is σ = 1211941685598. Its totient is φ = 1211941685596.

The previous prime is 1211941685569. The next prime is 1211941685599. The reversal of 1211941685597 is 7955861491121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1129956244036 + 81985441561 = 1062994^2 + 286331^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211941685597 - 2¹⁰ = 1211941684573 is a prime.

Together with 1211941685599, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211941685599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605970842798 + 605970842799.

It is an arithmetic number, because the mean of its divisors is an integer number (605970842799).

Almost surely, 2^{1211941685597} is an apocalyptic number.

It is an amenable number.

1211941685597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211941685597 is an equidigital number, since it uses as much as digits as its factorization.

1211941685597 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 59.

The spelling of 1211941685597 in words is "one trillion, two hundred eleven billion, nine hundred forty-one million, six hundred eighty-five thousand, five hundred ninety-seven".