3221131231 has 2 divisors, whose sum is σ = 3221131232. Its totient is φ = 3221131230.

The previous prime is 3221131223. The next prime is 3221131271. The reversal of 3221131231 is 1321311223.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3221131231 - 2³ = 3221131223 is a prime.

It is a super-2 number, since 2×3221131231² = 20751372814647150722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 3221131199 and 3221131208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3221131201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1610565615 + 1610565616.

It is an arithmetic number, because the mean of its divisors is an integer number (1610565616).

Almost surely, 2^3221131231 is an apocalyptic number.

3221131231 is a deficient number, since it is larger than the sum of its proper divisors (1).

3221131231 is an equidigital number, since it uses as much as digits as its factorization.

3221131231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 216, while the sum is 19.

The square root of 3221131231 is about 56755.0106246136. The cubic root of 3221131231 is about 1476.8491573544.

Adding to 3221131231 its reverse (1321311223), we get a palindrome (4542442454).

The spelling of 3221131231 in words is "three billion, two hundred twenty-one million, one hundred thirty-one thousand, two hundred thirty-one".