13437521 has 2 divisors, whose sum is σ = 13437522. Its totient is φ = 13437520.

The previous prime is 13437511. The next prime is 13437533. The reversal of 13437521 is 12573431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 5456896 = 2825^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 13437521 - 2¹⁰ = 13436497 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13437511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6718760 + 6718761.

It is an arithmetic number, because the mean of its divisors is an integer number (6718761).

Almost surely, 2^13437521 is an apocalyptic number.

It is an amenable number.

13437521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13437521 is an equidigital number, since it uses as much as digits as its factorization.

13437521 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 13437521 is about 3665.7224390289. The cubic root of 13437521 is about 237.7422591735.

The spelling of 13437521 in words is "thirteen million, four hundred thirty-seven thousand, five hundred twenty-one".