11115855 has 24 divisors (see below), whose sum is σ = 20283120. Its totient is φ = 5616000.

The previous prime is 11115851. The next prime is 11115857. The reversal of 11115855 is 55851111.

It is not a de Polignac number, because 11115855 - 2² = 11115851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11115851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5646 + ... + 7355.

It is an arithmetic number, because the mean of its divisors is an integer number (845130).

Almost surely, 2^11115855 is an apocalyptic number.

11115855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11115855 is a deficient number, since it is larger than the sum of its proper divisors (9167265).

11115855 is a wasteful number, since it uses less digits than its factorization.

11115855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13031 (or 13028 counting only the distinct ones).

The product of its digits is 1000, while the sum is 27.

The square root of 11115855 is about 3334.0448407303. The cubic root of 11115855 is about 223.1760693309.

Adding to 11115855 its reverse (55851111), we get a palindrome (66966966).

The spelling of 11115855 in words is "eleven million, one hundred fifteen thousand, eight hundred fifty-five".