18122011 has 8 divisors (see below), whose sum is σ = 18857984. Its totient is φ = 17395560.

The previous prime is 18121997. The next prime is 18122021. The reversal of 18122011 is 11022181.

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 18122011 - 2⁵ = 18121979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18122021) 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, 1636 + ... + 6238.

It is an arithmetic number, because the mean of its divisors is an integer number (2357248).

Almost surely, 2^18122011 is an apocalyptic number.

18122011 is a deficient number, since it is larger than the sum of its proper divisors (735973).

18122011 is a wasteful number, since it uses less digits than its factorization.

18122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 18122011 is about 4256.9955367606. The cubic root of 18122011 is about 262.6649533144.

Adding to 18122011 its reverse (11022181), we get a palindrome (29144192).

The spelling of 18122011 in words is "eighteen million, one hundred twenty-two thousand, eleven".