18061211 has 4 divisors (see below), whose sum is σ = 20641392. Its totient is φ = 15481032.

The previous prime is 18061201. The next prime is 18061223. The reversal of 18061211 is 11216081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11216081 = 347 ⋅32323.

It is not a de Polignac number, because 18061211 - 2¹⁰ = 18060187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18061201) 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, 1290080 + ... + 1290093.

It is an arithmetic number, because the mean of its divisors is an integer number (5160348).

Almost surely, 2^18061211 is an apocalyptic number.

18061211 is a deficient number, since it is larger than the sum of its proper divisors (2580181).

18061211 is an equidigital number, since it uses as much as digits as its factorization.

18061211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580180.

The product of its (nonzero) digits is 96, while the sum is 20.

The square root of 18061211 is about 4249.8483502356. The cubic root of 18061211 is about 262.3708740584.

Adding to 18061211 its reverse (11216081), we get a palindrome (29277292).

The spelling of 18061211 in words is "eighteen million, sixty-one thousand, two hundred eleven".