664231 has 4 divisors (see below), whose sum is σ = 666792. Its totient is φ = 661672.

The previous prime is 664211. The next prime is 664243. The reversal of 664231 is 132466.

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 664231 - 2⁵ = 664199 is a prime.

It is a super-2 number, since 2×664231² = 882405642722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664211) 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, 841 + ... + 1426.

It is an arithmetic number, because the mean of its divisors is an integer number (166698).

2⁶⁶⁴²³¹ is an apocalyptic number.

664231 is a deficient number, since it is larger than the sum of its proper divisors (2561).

664231 is a wasteful number, since it uses less digits than its factorization.

664231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560.

The product of its digits is 864, while the sum is 22.

The square root of 664231 is about 815.0036809733. The cubic root of 664231 is about 87.2515291068.

Adding to 664231 its reverse (132466), we get a palindrome (796697).

The spelling of 664231 in words is "six hundred sixty-four thousand, two hundred thirty-one".