12018511 has 4 divisors (see below), whose sum is σ = 12274272. Its totient is φ = 11762752.

The previous prime is 12018509. The next prime is 12018521. The reversal of 12018511 is 11581021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11581021 = 137 ⋅84533.

It is a cyclic number.

It is not a de Polignac number, because 12018511 - 2¹ = 12018509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12018521) 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, 127810 + ... + 127903.

It is an arithmetic number, because the mean of its divisors is an integer number (3068568).

Almost surely, 2^12018511 is an apocalyptic number.

12018511 is a deficient number, since it is larger than the sum of its proper divisors (255761).

12018511 is an equidigital number, since it uses as much as digits as its factorization.

12018511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255760.

The product of its (nonzero) digits is 80, while the sum is 19.

The square root of 12018511 is about 3466.7724182588. The cubic root of 12018511 is about 229.0605091717.

Adding to 12018511 its reverse (11581021), we get a palindrome (23599532).

The spelling of 12018511 in words is "twelve million, eighteen thousand, five hundred eleven".