7218851 has 4 divisors (see below), whose sum is σ = 7230192. Its totient is φ = 7207512.

The previous prime is 7218839. The next prime is 7218853. The reversal of 7218851 is 1588127.

It is a happy number.

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 7218851 - 2⁶ = 7218787 is a prime.

It is a super-2 number, since 2×7218851² = 104223619520402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7218853) 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, 4655 + ... + 6008.

It is an arithmetic number, because the mean of its divisors is an integer number (1807548).

Almost surely, 2^7218851 is an apocalyptic number.

7218851 is a deficient number, since it is larger than the sum of its proper divisors (11341).

7218851 is a wasteful number, since it uses less digits than its factorization.

7218851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11340.

The product of its digits is 4480, while the sum is 32.

The square root of 7218851 is about 2686.7919532409. The cubic root of 7218851 is about 193.2662526559.

The spelling of 7218851 in words is "seven million, two hundred eighteen thousand, eight hundred fifty-one".