668231 has 4 divisors (see below), whose sum is σ = 673464. Its totient is φ = 663000.

The previous prime is 668221. The next prime is 668243. The reversal of 668231 is 132866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668231 is a prime.

It is a super-2 number, since 2×668231² = 893065338722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 668231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668201) 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, 2420 + ... + 2681.

It is an arithmetic number, because the mean of its divisors is an integer number (168366).

2⁶⁶⁸²³¹ is an apocalyptic number.

668231 is a deficient number, since it is larger than the sum of its proper divisors (5233).

668231 is a wasteful number, since it uses less digits than its factorization.

668231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5232.

The product of its digits is 1728, while the sum is 26.

The square root of 668231 is about 817.4539742395. The cubic root of 668231 is about 87.4263216509.

The spelling of 668231 in words is "six hundred sixty-eight thousand, two hundred thirty-one".