7218061 has 4 divisors (see below), whose sum is σ = 7292572. Its totient is φ = 7143552.

The previous prime is 7218059. The next prime is 7218083. The reversal of 7218061 is 1608127.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3493161 + 3724900 = 1869^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 7218061 - 2¹ = 7218059 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 (7218161) 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, 37110 + ... + 37303.

It is an arithmetic number, because the mean of its divisors is an integer number (1823143).

Almost surely, 2^7218061 is an apocalyptic number.

It is an amenable number.

7218061 is a deficient number, since it is larger than the sum of its proper divisors (74511).

7218061 is an equidigital number, since it uses as much as digits as its factorization.

7218061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74510.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 7218061 is about 2686.6449337417. The cubic root of 7218061 is about 193.2592023229.

The spelling of 7218061 in words is "seven million, two hundred eighteen thousand, sixty-one".