662121 has 16 divisors (see below), whose sum is σ = 993600. Its totient is φ = 435744.

The previous prime is 662111. The next prime is 662141. The reversal of 662121 is 121266.

It is a happy number.

662121 is a `hidden beast` number, since 662 + 1 + 2 + 1 = 666.

662121 is nontrivially palindromic in base 7.

It is not a de Polignac number, because 662121 - 2⁷ = 661993 is a prime.

662121 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 662094 and 662103.

It is not an unprimeable number, because it can be changed into a prime (662111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3610 + ... + 3788.

It is an arithmetic number, because the mean of its divisors is an integer number (62100).

2⁶⁶²¹²¹ is an apocalyptic number.

It is an amenable number.

662121 is a deficient number, since it is larger than the sum of its proper divisors (331479).

662121 is a wasteful number, since it uses less digits than its factorization.

662121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325 (or 319 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 662121 is about 813.7081786488. The cubic root of 662121 is about 87.1590432047.

Adding to 662121 its reverse (121266), we get a palindrome (783387).

It can be divided in two parts, 66 and 2121, that added together give a 7-th power (2187 = 3⁷).

The spelling of 662121 in words is "six hundred sixty-two thousand, one hundred twenty-one".