13218533 has 2 divisors, whose sum is σ = 13218534. Its totient is φ = 13218532.

The previous prime is 13218529. The next prime is 13218559. The reversal of 13218533 is 33581231.

It is an a-pointer prime, because the next prime (13218559) can be obtained adding 13218533 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12264004 + 954529 = 3502^2 + 977^2 .

It is a cyclic number.

It is not a de Polignac number, because 13218533 - 2² = 13218529 is a prime.

It is a super-2 number, since 2×13218533² = 349459229344178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13212533) 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, 6609266 + 6609267.

It is an arithmetic number, because the mean of its divisors is an integer number (6609267).

Almost surely, 2^13218533 is an apocalyptic number.

It is an amenable number.

13218533 is a deficient number, since it is larger than the sum of its proper divisors (1).

13218533 is an equidigital number, since it uses as much as digits as its factorization.

13218533 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 26.

The square root of 13218533 is about 3635.7300504850. The cubic root of 13218533 is about 236.4437034779.

Adding to 13218533 its reverse (33581231), we get a palindrome (46799764).

The spelling of 13218533 in words is "thirteen million, two hundred eighteen thousand, five hundred thirty-three".