18012111 has 16 divisors (see below), whose sum is σ = 26008416. Its totient is φ = 11022336.

The previous prime is 18012097. The next prime is 18012121. The reversal of 18012111 is 11121081.

It is not a de Polignac number, because 18012111 - 2⁶ = 18012047 is a prime.

It is a super-2 number, since 2×18012111² = 648872285352642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6331 + ... + 8723.

It is an arithmetic number, because the mean of its divisors is an integer number (1625526).

Almost surely, 2^18012111 is an apocalyptic number.

18012111 is a deficient number, since it is larger than the sum of its proper divisors (7996305).

18012111 is a wasteful number, since it uses less digits than its factorization.

18012111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2602.

The product of its (nonzero) digits is 16, while the sum is 15.

The square root of 18012111 is about 4244.0677421549. The cubic root of 18012111 is about 262.1329036490.

Adding to 18012111 its reverse (11121081), we get a palindrome (29133192).

The spelling of 18012111 in words is "eighteen million, twelve thousand, one hundred eleven".