13641521 has 2 divisors, whose sum is σ = 13641522. Its totient is φ = 13641520.

The previous prime is 13641517. The next prime is 13641527. The reversal of 13641521 is 12514631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11424400 + 2217121 = 3380^2 + 1489^2 .

It is a cyclic number.

It is not a de Polignac number, because 13641521 - 2² = 13641517 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13641527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6820760 + 6820761.

It is an arithmetic number, because the mean of its divisors is an integer number (6820761).

Almost surely, 2^13641521 is an apocalyptic number.

It is an amenable number.

13641521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13641521 is an equidigital number, since it uses as much as digits as its factorization.

13641521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 720, while the sum is 23.

The square root of 13641521 is about 3693.4429737035. The cubic root of 13641521 is about 238.9393063789.

The spelling of 13641521 in words is "thirteen million, six hundred forty-one thousand, five hundred twenty-one".