660331 has 16 divisors (see below), whose sum is σ = 829440. Its totient is φ = 512640.

The previous prime is 660329. The next prime is 660337. The reversal of 660331 is 133066.

It is a happy number.

660331 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 660331 - 2¹ = 660329 is a prime.

It is a super-2 number, since 2×660331² = 872074059122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 660299 and 660308.

It is not an unprimeable number, because it can be changed into a prime (660337) 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, 3600 + ... + 3778.

It is an arithmetic number, because the mean of its divisors is an integer number (51840).

2⁶⁶⁰³³¹ is an apocalyptic number.

660331 is a deficient number, since it is larger than the sum of its proper divisors (169109).

660331 is a wasteful number, since it uses less digits than its factorization.

660331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 660331 is about 812.6075313459. The cubic root of 660331 is about 87.0804294314.

Adding to 660331 its reverse (133066), we get a palindrome (793397).

The spelling of 660331 in words is "six hundred sixty thousand, three hundred thirty-one".