6631213 has 2 divisors, whose sum is σ = 6631214. Its totient is φ = 6631212.

The previous prime is 6631193. The next prime is 6631223. The reversal of 6631213 is 3121366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3948169 + 2683044 = 1987^2 + 1638^2 .

It is a cyclic number.

It is not a de Polignac number, because 6631213 - 2¹³ = 6623021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6631223) 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, 3315606 + 3315607.

It is an arithmetic number, because the mean of its divisors is an integer number (3315607).

Almost surely, 2^6631213 is an apocalyptic number.

It is an amenable number.

6631213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6631213 is an equidigital number, since it uses as much as digits as its factorization.

6631213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 22.

The square root of 6631213 is about 2575.1141722262. The cubic root of 6631213 is about 187.8729808223.

Adding to 6631213 its reverse (3121366), we get a palindrome (9752579).

The spelling of 6631213 in words is "six million, six hundred thirty-one thousand, two hundred thirteen".