18015201 has 12 divisors (see below), whose sum is σ = 26138580. Its totient is φ = 11956320.

The previous prime is 18015197. The next prime is 18015253. The reversal of 18015201 is 10251081.

It can be written as a sum of positive squares in 2 ways, for example, as 10595025 + 7420176 = 3255^2 + 2724^2 .

It is not a de Polignac number, because 18015201 - 2² = 18015197 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18015301) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2310 + ... + 6431.

It is an arithmetic number, because the mean of its divisors is an integer number (2178215).

Almost surely, 2^18015201 is an apocalyptic number.

It is an amenable number.

18015201 is a deficient number, since it is larger than the sum of its proper divisors (8123379).

18015201 is a wasteful number, since it uses less digits than its factorization.

18015201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8976 (or 8973 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

The square root of 18015201 is about 4244.4317640881. The cubic root of 18015201 is about 262.1478925335.

Adding to 18015201 its reverse (10251081), we get a palindrome (28266282).

The spelling of 18015201 in words is "eighteen million, fifteen thousand, two hundred one".