668031 has 16 divisors (see below), whose sum is σ = 1096704. Its totient is φ = 352224.

The previous prime is 668029. The next prime is 668033. The reversal of 668031 is 130866.

It is an interprime number because it is at equal distance from previous prime (668029) and next prime (668033).

It is not a de Polignac number, because 668031 - 2¹ = 668029 is a prime.

It is a super-2 number, since 2×668031² = 892530833922, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 667992 and 668010.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 668031.

It is not an unprimeable number, because it can be changed into a prime (668033) 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, 951 + ... + 1496.

It is an arithmetic number, because the mean of its divisors is an integer number (68544).

2⁶⁶⁸⁰³¹ is an apocalyptic number.

668031 is a deficient number, since it is larger than the sum of its proper divisors (428673).

668031 is a wasteful number, since it uses less digits than its factorization.

668031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2470.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 668031 is about 817.3316340385. The cubic root of 668031 is about 87.4175986150.

Adding to 668031 its reverse (130866), we get a palindrome (798897).

The spelling of 668031 in words is "six hundred sixty-eight thousand, thirty-one".