12018561 has 8 divisors (see below), whose sum is σ = 16174944. Its totient is φ = 7937280.

The previous prime is 12018553. The next prime is 12018569. The reversal of 12018561 is 16581021.

12018561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12018553) and next prime (12018569).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12018561 - 2³ = 12018553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12018569) 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, 18400 + ... + 19041.

It is an arithmetic number, because the mean of its divisors is an integer number (2021868).

Almost surely, 2^12018561 is an apocalyptic number.

It is an amenable number.

12018561 is a deficient number, since it is larger than the sum of its proper divisors (4156383).

12018561 is a wasteful number, since it uses less digits than its factorization.

12018561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37551.

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

The square root of 12018561 is about 3466.7796295698. The cubic root of 12018561 is about 229.0608268209.

Adding to 12018561 its reverse (16581021), we get a palindrome (28599582).

It can be divided in two parts, 120 and 18561, that added together give a palindrome (18681).

The spelling of 12018561 in words is "twelve million, eighteen thousand, five hundred sixty-one".