1211197904849 has 2 divisors, whose sum is σ = 1211197904850. Its totient is φ = 1211197904848.

The previous prime is 1211197904837. The next prime is 1211197904881. The reversal of 1211197904849 is 9484097911121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1157922340624 + 53275564225 = 1076068^2 + 230815^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211197904849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1211197904794 and 1211197904803.

It is not a weakly prime, because it can be changed into another prime (1211197909849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605598952424 + 605598952425.

It is an arithmetic number, because the mean of its divisors is an integer number (605598952425).

Almost surely, 2^{1211197904849} is an apocalyptic number.

It is an amenable number.

1211197904849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211197904849 is an equidigital number, since it uses as much as digits as its factorization.

1211197904849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The spelling of 1211197904849 in words is "one trillion, two hundred eleven billion, one hundred ninety-seven million, nine hundred four thousand, eight hundred forty-nine".