11123143261 has 2 divisors, whose sum is σ = 11123143262. Its totient is φ = 11123143260.

The previous prime is 11123143223. The next prime is 11123143279. The reversal of 11123143261 is 16234132111.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7353920025 + 3769223236 = 85755^2 + 61394^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123143261 - 2⁷ = 11123143133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11123143211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561571630 + 5561571631.

It is an arithmetic number, because the mean of its divisors is an integer number (5561571631).

Almost surely, 2^11123143261 is an apocalyptic number.

It is an amenable number.

11123143261 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123143261 is an equidigital number, since it uses as much as digits as its factorization.

11123143261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

Adding to 11123143261 its reverse (16234132111), we get a palindrome (27357275372).

The spelling of 11123143261 in words is "eleven billion, one hundred twenty-three million, one hundred forty-three thousand, two hundred sixty-one".