1211351241181 has 2 divisors, whose sum is σ = 1211351241182. Its totient is φ = 1211351241180.

The previous prime is 1211351241179. The next prime is 1211351241197. The reversal of 1211351241181 is 1811421531121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 724824065956 + 486527175225 = 851366^2 + 697515^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211351241181 - 2¹ = 1211351241179 is a prime.

It is a super-2 number, since 2×1211351241181² (a number of 25 digits) contains 22 as substring.

Together with 1211351241179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1211351241131) 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, 605675620590 + 605675620591.

It is an arithmetic number, because the mean of its divisors is an integer number (605675620591).

Almost surely, 2^{1211351241181} is an apocalyptic number.

It is an amenable number.

1211351241181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211351241181 is an equidigital number, since it uses as much as digits as its factorization.

1211351241181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 31.

The spelling of 1211351241181 in words is "one trillion, two hundred eleven billion, three hundred fifty-one million, two hundred forty-one thousand, one hundred eighty-one".