11115857 has 2 divisors, whose sum is σ = 11115858. Its totient is φ = 11115856.

The previous prime is 11115851. The next prime is 11115859. The reversal of 11115857 is 75851111.

It is a happy number.

11115857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10042561 + 1073296 = 3169^2 + 1036^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11115857 is a prime.

Together with 11115859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (11115851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5557928 + 5557929.

It is an arithmetic number, because the mean of its divisors is an integer number (5557929).

Almost surely, 2^11115857 is an apocalyptic number.

It is an amenable number.

11115857 is a deficient number, since it is larger than the sum of its proper divisors (1).

11115857 is an equidigital number, since it uses as much as digits as its factorization.

11115857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 29.

The square root of 11115857 is about 3334.0451406662. The cubic root of 11115857 is about 223.1760827157.

Adding to 11115857 its reverse (75851111), we get a palindrome (86966968).

The spelling of 11115857 in words is "eleven million, one hundred fifteen thousand, eight hundred fifty-seven".