18011201 has 4 divisors (see below), whose sum is σ = 19396692. Its totient is φ = 16625712.

The previous prime is 18011179. The next prime is 18011207. The reversal of 18011201 is 10211081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10211081 = 43 ⋅237467.

It can be written as a sum of positive squares in 2 ways, for example, as 10086976 + 7924225 = 3176^2 + 2815^2 .

It is a cyclic number.

It is not a de Polignac number, because 18011201 - 2⁶ = 18011137 is a prime.

It is a super-2 number, since 2×18011201² = 648806722924802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18011207) 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, 692726 + ... + 692751.

It is an arithmetic number, because the mean of its divisors is an integer number (4849173).

Almost surely, 2^18011201 is an apocalyptic number.

It is an amenable number.

18011201 is a deficient number, since it is larger than the sum of its proper divisors (1385491).

18011201 is a wasteful number, since it uses less digits than its factorization.

18011201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385490.

The product of its (nonzero) digits is 16, while the sum is 14.

The square root of 18011201 is about 4243.9605323330. The cubic root of 18011201 is about 262.1284891199.

Adding to 18011201 its reverse (10211081), we get a palindrome (28222282).

The spelling of 18011201 in words is "eighteen million, eleven thousand, two hundred one".