13222637 has 4 divisors (see below), whose sum is σ = 13678620. Its totient is φ = 12766656.

The previous prime is 13222633. The next prime is 13222639. The reversal of 13222637 is 73622231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9357481 + 3865156 = 3059^2 + 1966^2 .

It is a cyclic number.

It is not a de Polignac number, because 13222637 - 2² = 13222633 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13222633) 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 in 3 ways as a sum of consecutive naturals, for example, 227948 + ... + 228005.

It is an arithmetic number, because the mean of its divisors is an integer number (3419655).

Almost surely, 2^13222637 is an apocalyptic number.

It is an amenable number.

13222637 is a deficient number, since it is larger than the sum of its proper divisors (455983).

13222637 is an equidigital number, since it uses as much as digits as its factorization.

13222637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455982.

The product of its digits is 3024, while the sum is 26.

The square root of 13222637 is about 3636.2944050228. The cubic root of 13222637 is about 236.4681707556.

Adding to 13222637 its reverse (73622231), we get a palindrome (86844868).

The spelling of 13222637 in words is "thirteen million, two hundred twenty-two thousand, six hundred thirty-seven".