6661231 has 2 divisors, whose sum is σ = 6661232. Its totient is φ = 6661230.

The previous prime is 6661223. The next prime is 6661243. The reversal of 6661231 is 1321666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6661231 - 2³ = 6661223 is a prime.

It is a super-2 number, since 2×6661231² = 88743996870722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6661196 and 6661205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6661211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330615 + 3330616.

It is an arithmetic number, because the mean of its divisors is an integer number (3330616).

Almost surely, 2^6661231 is an apocalyptic number.

6661231 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661231 is an equidigital number, since it uses as much as digits as its factorization.

6661231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 25.

The square root of 6661231 is about 2580.9360704985. The cubic root of 6661231 is about 188.1560402860.

Adding to 6661231 its reverse (1321666), we get a palindrome (7982897).

The spelling of 6661231 in words is "six million, six hundred sixty-one thousand, two hundred thirty-one".