668131 has 4 divisors (see below), whose sum is σ = 691200. Its totient is φ = 645064.

The previous prime is 668111. The next prime is 668141. The reversal of 668131 is 131866.

668131 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.

It is a cyclic number.

It is not a de Polignac number, because 668131 - 2¹⁵ = 635363 is a prime.

It is a super-2 number, since 2×668131² = 892798066322, 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 = 668096 and 668105.

It is not an unprimeable number, because it can be changed into a prime (668111) 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, 11491 + ... + 11548.

It is an arithmetic number, because the mean of its divisors is an integer number (172800).

2⁶⁶⁸¹³¹ is an apocalyptic number.

668131 is a deficient number, since it is larger than the sum of its proper divisors (23069).

668131 is a wasteful number, since it uses less digits than its factorization.

668131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23068.

The product of its digits is 864, while the sum is 25.

The square root of 668131 is about 817.3928064279. The cubic root of 668131 is about 87.4219603505.

Adding to 668131 its reverse (131866), we get a palindrome (799997).

The spelling of 668131 in words is "six hundred sixty-eight thousand, one hundred thirty-one".