7221166 has 16 divisors (see below), whose sum is σ = 11240208. Its totient is φ = 3476800.

The previous prime is 7221163. The next prime is 7221169. The reversal of 7221166 is 6611227.

It is an interprime number because it is at equal distance from previous prime (7221163) and next prime (7221169).

It is a self number, because there is not a number n which added to its sum of digits gives 7221166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7221161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6276 + ... + 7336.

It is an arithmetic number, because the mean of its divisors is an integer number (702513).

Almost surely, 2^7221166 is an apocalyptic number.

7221166 is a deficient number, since it is larger than the sum of its proper divisors (4019042).

7221166 is a wasteful number, since it uses less digits than its factorization.

7221166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187.

The product of its digits is 1008, while the sum is 25.

The square root of 7221166 is about 2687.2227298830. Note that the first 3 decimals coincide. The cubic root of 7221166 is about 193.2869098471.

The spelling of 7221166 in words is "seven million, two hundred twenty-one thousand, one hundred sixty-six".