11055511 has 4 divisors (see below), whose sum is σ = 11637400. Its totient is φ = 10473624.

The previous prime is 11055509. The next prime is 11055523. The reversal of 11055511 is 11555011.

It is a happy number.

11055511 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.

It is a cyclic number.

It is not a de Polignac number, because 11055511 - 2¹ = 11055509 is a prime.

It is a super-2 number, since 2×11055511² = 244448646942242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19), and also a Moran number because the ratio is a prime number: 581869 = 11055511 / (1 + 1 + 0 + 5 + 5 + 5 + 1 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11055211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290916 + ... + 290953.

It is an arithmetic number, because the mean of its divisors is an integer number (2909350).

Almost surely, 2^11055511 is an apocalyptic number.

11055511 is a deficient number, since it is larger than the sum of its proper divisors (581889).

11055511 is an equidigital number, since it uses as much as digits as its factorization.

11055511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581888.

The product of its (nonzero) digits is 125, while the sum is 19.

The square root of 11055511 is about 3324.9828570987. The cubic root of 11055511 is about 222.7714886583.

Subtracting 11055511 from its reverse (11555011), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 11055511 in words is "eleven million, fifty-five thousand, five hundred eleven".