667601231 has 4 divisors (see below), whose sum is σ = 728292264. Its totient is φ = 606910200.

The previous prime is 667601227. The next prime is 667601261. The reversal of 667601231 is 132106766.

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 667601231 - 2² = 667601227 is a prime.

It is a super-2 number, since 2×667601231² = 891382807265430722, 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 (667601201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30345500 + ... + 30345521.

It is an arithmetic number, because the mean of its divisors is an integer number (182073066).

Almost surely, 2^667601231 is an apocalyptic number.

667601231 is a deficient number, since it is larger than the sum of its proper divisors (60691033).

667601231 is a wasteful number, since it uses less digits than its factorization.

667601231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60691032.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 667601231 is about 25837.9803970821. The cubic root of 667601231 is about 873.9884827084.

Adding to 667601231 its reverse (132106766), we get a palindrome (799707997).

The spelling of 667601231 in words is "six hundred sixty-seven million, six hundred one thousand, two hundred thirty-one".