11111122261 has 2 divisors, whose sum is σ = 11111122262. Its totient is φ = 11111122260.

The previous prime is 11111122249. The next prime is 11111122273. The reversal of 11111122261 is 16222111111.

It is a balanced prime because it is at equal distance from previous prime (11111122249) and next prime (11111122273).

It can be written as a sum of positive squares in only one way, i.e., 10708317361 + 402804900 = 103481^2 + 20070^2 .

It is a cyclic number.

It is not a de Polignac number, because 11111122261 - 2¹¹ = 11111120213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11111122961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5555561130 + 5555561131.

It is an arithmetic number, because the mean of its divisors is an integer number (5555561131).

Almost surely, 2^11111122261 is an apocalyptic number.

It is an amenable number.

11111122261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11111122261 is an equidigital number, since it uses as much as digits as its factorization.

11111122261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 48, while the sum is 19.

Adding to 11111122261 its reverse (16222111111), we get a palindrome (27333233372).

The spelling of 11111122261 in words is "eleven billion, one hundred eleven million, one hundred twenty-two thousand, two hundred sixty-one".