11143855 has 4 divisors (see below), whose sum is σ = 13372632. Its totient is φ = 8915080.

The previous prime is 11143817. The next prime is 11143871. The reversal of 11143855 is 55834111.

11143855 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55834111 = 263 ⋅212297.

It is a de Polignac number, because none of the positive numbers 2^k-11143855 is a prime.

It is a super-2 number, since 2×11143855² = 248371008522050, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114381 + ... + 1114390.

It is an arithmetic number, because the mean of its divisors is an integer number (3343158).

Almost surely, 2^11143855 is an apocalyptic number.

11143855 is a deficient number, since it is larger than the sum of its proper divisors (2228777).

11143855 is an equidigital number, since it uses as much as digits as its factorization.

11143855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228776.

The product of its digits is 2400, while the sum is 28.

The square root of 11143855 is about 3338.2413034411. The cubic root of 11143855 is about 223.3633001050.

Adding to 11143855 its reverse (55834111), we get a palindrome (66977966).

The spelling of 11143855 in words is "eleven million, one hundred forty-three thousand, eight hundred fifty-five".