13634521 has 2 divisors, whose sum is σ = 13634522. Its totient is φ = 13634520.

The previous prime is 13634519. The next prime is 13634557. The reversal of 13634521 is 12543631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7080921 + 6553600 = 2661^2 + 2560^2 .

It is a cyclic number.

It is not a de Polignac number, because 13634521 - 2¹ = 13634519 is a prime.

Together with 13634519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (13634501) 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, 6817260 + 6817261.

It is an arithmetic number, because the mean of its divisors is an integer number (6817261).

Almost surely, 2^13634521 is an apocalyptic number.

It is an amenable number.

13634521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13634521 is an equidigital number, since it uses as much as digits as its factorization.

13634521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 25.

The square root of 13634521 is about 3692.4952268080. The cubic root of 13634521 is about 238.8984296732.

The spelling of 13634521 in words is "thirteen million, six hundred thirty-four thousand, five hundred twenty-one".