660121 has 8 divisors (see below), whose sum is σ = 823104. Its totient is φ = 514320.

The previous prime is 660119. The next prime is 660131. The reversal of 660121 is 121066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 660121 - 2¹ = 660119 is a prime.

It is a Duffinian number.

660121 is a modest number, since divided by 121 gives 66 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 660095 and 660104.

It is not an unprimeable number, because it can be changed into a prime (660131) 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, 4210 + ... + 4363.

It is an arithmetic number, because the mean of its divisors is an integer number (102888).

2⁶⁶⁰¹²¹ is an apocalyptic number.

It is an amenable number.

660121 is a deficient number, since it is larger than the sum of its proper divisors (162983).

660121 is a wasteful number, since it uses less digits than its factorization.

660121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8591.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 660121 is about 812.4783074027. The cubic root of 660121 is about 87.0711972791.

Adding to 660121 its reverse (121066), we get a palindrome (781187).

The spelling of 660121 in words is "six hundred sixty thousand, one hundred twenty-one".