1131211322261 has 2 divisors, whose sum is σ = 1131211322262. Its totient is φ = 1131211322260.

The previous prime is 1131211322243. The next prime is 1131211322321. The reversal of 1131211322261 is 1622231121311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 749774151025 + 381437171236 = 865895^2 + 617606^2 .

It is an emirp because it is prime and its reverse (1622231121311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1131211322261 - 2¹⁰ = 1131211321237 is a prime.

It is a super-2 number, since 2×1131211322261² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1131211322261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131211322221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565605661130 + 565605661131.

It is an arithmetic number, because the mean of its divisors is an integer number (565605661131).

Almost surely, 2^{1131211322261} is an apocalyptic number.

It is an amenable number.

1131211322261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131211322261 is an equidigital number, since it uses as much as digits as its factorization.

1131211322261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 26.

Adding to 1131211322261 its reverse (1622231121311), we get a palindrome (2753442443572).

The spelling of 1131211322261 in words is "one trillion, one hundred thirty-one billion, two hundred eleven million, three hundred twenty-two thousand, two hundred sixty-one".