13509212 has 6 divisors (see below), whose sum is σ = 23641128. Its totient is φ = 6754604.

The previous prime is 13509191. The next prime is 13509217. The reversal of 13509212 is 21290531.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13509217) 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, 1688648 + ... + 1688655.

It is an arithmetic number, because the mean of its divisors is an integer number (3940188).

Almost surely, 2^13509212 is an apocalyptic number.

It is an amenable number.

13509212 is a deficient number, since it is larger than the sum of its proper divisors (10131916).

13509212 is a wasteful number, since it uses less digits than its factorization.

13509212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377307 (or 3377305 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 13509212 is about 3675.4879948110. The cubic root of 13509212 is about 238.1643052531.

Adding to 13509212 its reverse (21290531), we get a palindrome (34799743).

The spelling of 13509212 in words is "thirteen million, five hundred nine thousand, two hundred twelve".