18225911 has 4 divisors (see below), whose sum is σ = 19882824. Its totient is φ = 16569000.

The previous prime is 18225869. The next prime is 18225917. The reversal of 18225911 is 11952281.

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 18225911 - 2⁶ = 18225847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18225917) 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, 828440 + ... + 828461.

It is an arithmetic number, because the mean of its divisors is an integer number (4970706).

Almost surely, 2^18225911 is an apocalyptic number.

18225911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18225911 is a deficient number, since it is larger than the sum of its proper divisors (1656913).

18225911 is a wasteful number, since it uses less digits than its factorization.

18225911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656912.

The product of its digits is 1440, while the sum is 29.

The square root of 18225911 is about 4269.1815374847. The cubic root of 18225911 is about 263.1659811894.

The spelling of 18225911 in words is "eighteen million, two hundred twenty-five thousand, nine hundred eleven".