13223557 has 2 divisors, whose sum is σ = 13223558. Its totient is φ = 13223556.

The previous prime is 13223549. The next prime is 13223593. The reversal of 13223557 is 75532231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10666756 + 2556801 = 3266^2 + 1599^2 .

It is an emirp because it is prime and its reverse (75532231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13223557 - 2³ = 13223549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13223527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6611778 + 6611779.

It is an arithmetic number, because the mean of its divisors is an integer number (6611779).

Almost surely, 2^13223557 is an apocalyptic number.

It is an amenable number.

13223557 is a deficient number, since it is larger than the sum of its proper divisors (1).

13223557 is an equidigital number, since it uses as much as digits as its factorization.

13223557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 28.

The square root of 13223557 is about 3636.4209052309. The cubic root of 13223557 is about 236.4736549282.

Adding to 13223557 its reverse (75532231), we get a palindrome (88755788).

The spelling of 13223557 in words is "thirteen million, two hundred twenty-three thousand, five hundred fifty-seven".