11123231857 has 2 divisors, whose sum is σ = 11123231858. Its totient is φ = 11123231856.

The previous prime is 11123231831. The next prime is 11123231897. The reversal of 11123231857 is 75813232111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10536817201 + 586414656 = 102649^2 + 24216^2 .

It is a cyclic number.

It is not a de Polignac number, because 11123231857 - 2⁷ = 11123231729 is a prime.

It is not a weakly prime, because it can be changed into another prime (11123231897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5561615928 + 5561615929.

It is an arithmetic number, because the mean of its divisors is an integer number (5561615929).

Almost surely, 2^11123231857 is an apocalyptic number.

It is an amenable number.

11123231857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11123231857 is an equidigital number, since it uses as much as digits as its factorization.

11123231857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 34.

Adding to 11123231857 its reverse (75813232111), we get a palindrome (86936463968).

The spelling of 11123231857 in words is "eleven billion, one hundred twenty-three million, two hundred thirty-one thousand, eight hundred fifty-seven".