667271 has 4 divisors (see below), whose sum is σ = 727944. Its totient is φ = 606600.

The previous prime is 667243. The next prime is 667273. The reversal of 667271 is 172766.

667271 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 a de Polignac number, because none of the positive numbers 2^k-667271 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667273) 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, 30320 + ... + 30341.

It is an arithmetic number, because the mean of its divisors is an integer number (181986).

2⁶⁶⁷²⁷¹ is an apocalyptic number.

667271 is a deficient number, since it is larger than the sum of its proper divisors (60673).

667271 is a wasteful number, since it uses less digits than its factorization.

667271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60672.

The product of its digits is 3528, while the sum is 29.

The square root of 667271 is about 816.8665741723. The cubic root of 667271 is about 87.3844351912.

It can be divided in two parts, 66 and 7271, that added together give a palindrome (7337).

The spelling of 667271 in words is "six hundred sixty-seven thousand, two hundred seventy-one".