7218011 has 4 divisors (see below), whose sum is σ = 7231224. Its totient is φ = 7204800.

The previous prime is 7217963. The next prime is 7218019. The reversal of 7218011 is 1108127.

7218011 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 7218011 - 2¹⁰ = 7216987 is a prime.

It is a super-2 number, since 2×7218011² = 104199365592242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7218019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5750 + ... + 6891.

It is an arithmetic number, because the mean of its divisors is an integer number (1807806).

Almost surely, 2^7218011 is an apocalyptic number.

7218011 is the 1202-nd centered decagonal number.

7218011 is a deficient number, since it is larger than the sum of its proper divisors (13213).

7218011 is a wasteful number, since it uses less digits than its factorization.

7218011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13212.

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 7218011 is about 2686.6356284394. The cubic root of 7218011 is about 193.2587560820.

The spelling of 7218011 in words is "seven million, two hundred eighteen thousand, eleven".