662221 has 4 divisors (see below), whose sum is σ = 756832. Its totient is φ = 567612.

The previous prime is 662203. The next prime is 662227. The reversal of 662221 is 122266.

662221 is digitally balanced in base 2, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 662221 - 2¹³ = 654029 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662227) 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, 47295 + ... + 47308.

It is an arithmetic number, because the mean of its divisors is an integer number (189208).

2⁶⁶²²²¹ is an apocalyptic number.

It is an amenable number.

662221 is a deficient number, since it is larger than the sum of its proper divisors (94611).

662221 is an equidigital number, since it uses as much as digits as its factorization.

662221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94610.

The product of its digits is 288, while the sum is 19.

The square root of 662221 is about 813.7696234193. The cubic root of 662221 is about 87.1634308547.

Adding to 662221 its reverse (122266), we get a palindrome (784487).

The spelling of 662221 in words is "six hundred sixty-two thousand, two hundred twenty-one".