13521437 has 2 divisors, whose sum is σ = 13521438. Its totient is φ = 13521436.

The previous prime is 13521421. The next prime is 13521449. The reversal of 13521437 is 73412531.

13521437 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7474756 + 6046681 = 2734^2 + 2459^2 .

It is a cyclic number.

It is not a de Polignac number, because 13521437 - 2⁴ = 13521421 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13521637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6760718 + 6760719.

It is an arithmetic number, because the mean of its divisors is an integer number (6760719).

Almost surely, 2^13521437 is an apocalyptic number.

It is an amenable number.

13521437 is a deficient number, since it is larger than the sum of its proper divisors (1).

13521437 is an equidigital number, since it uses as much as digits as its factorization.

13521437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 13521437 is about 3677.1506632174. The cubic root of 13521437 is about 238.2361249075.

Adding to 13521437 its reverse (73412531), we get a palindrome (86933968).

The spelling of 13521437 in words is "thirteen million, five hundred twenty-one thousand, four hundred thirty-seven".