18561201 has 4 divisors (see below), whose sum is σ = 24748272. Its totient is φ = 12374132.

The previous prime is 18561181. The next prime is 18561209. The reversal of 18561201 is 10216581.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 10216581 = 3 ⋅3405527.

It is a cyclic number.

It is not a de Polignac number, because 18561201 - 2¹¹ = 18559153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18561209) 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, 3093531 + ... + 3093536.

It is an arithmetic number, because the mean of its divisors is an integer number (6187068).

Almost surely, 2^18561201 is an apocalyptic number.

It is an amenable number.

18561201 is a deficient number, since it is larger than the sum of its proper divisors (6187071).

18561201 is an equidigital number, since it uses as much as digits as its factorization.

18561201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6187070.

The product of its (nonzero) digits is 480, while the sum is 24.

The square root of 18561201 is about 4308.2712310160. The cubic root of 18561201 is about 264.7699486788.

Adding to 18561201 its reverse (10216581), we get a palindrome (28777782).

The spelling of 18561201 in words is "eighteen million, five hundred sixty-one thousand, two hundred one".