18211055 has 8 divisors (see below), whose sum is σ = 22803552. Its totient is φ = 13935328.

The previous prime is 18211051. The next prime is 18211057. The reversal of 18211055 is 55011281.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18211055 - 2² = 18211051 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18211055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18211051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79064 + ... + 79293.

It is an arithmetic number, because the mean of its divisors is an integer number (2850444).

Almost surely, 2^18211055 is an apocalyptic number.

18211055 is a deficient number, since it is larger than the sum of its proper divisors (4592497).

18211055 is a wasteful number, since it uses less digits than its factorization.

18211055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158385.

The product of its (nonzero) digits is 400, while the sum is 23.

The square root of 18211055 is about 4267.4412708320. The cubic root of 18211055 is about 263.0944592677.

The spelling of 18211055 in words is "eighteen million, two hundred eleven thousand, fifty-five".