660031 has 4 divisors (see below), whose sum is σ = 688752. Its totient is φ = 631312.

The previous prime is 660029. The next prime is 660047. The reversal of 660031 is 130066.

It is a happy number.

660031 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 an emirpimes, since its reverse is a distinct semiprime: 130066 = 2 ⋅65033.

It is a cyclic number.

It is not a de Polignac number, because 660031 - 2¹ = 660029 is a prime.

It is a super-2 number, since 2×660031² = 871281841922, which contains 22 as substring.

It is a Duffinian number.

660031 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 659987 and 660014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660001) 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, 14326 + ... + 14371.

It is an arithmetic number, because the mean of its divisors is an integer number (172188).

2⁶⁶⁰⁰³¹ is an apocalyptic number.

660031 is a deficient number, since it is larger than the sum of its proper divisors (28721).

660031 is a wasteful number, since it uses less digits than its factorization.

660031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28720.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 660031 is about 812.4229194207. The cubic root of 660031 is about 87.0672400430.

Adding to 660031 its reverse (130066), we get a palindrome (790097).

The spelling of 660031 in words is "six hundred sixty thousand, thirty-one".