13821601 has 4 divisors (see below), whose sum is σ = 14011012. Its totient is φ = 13632192.

The previous prime is 13821589. The next prime is 13821637. The reversal of 13821601 is 10612831.

13821601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5527201 + 8294400 = 2351^2 + 2880^2 .

It is a cyclic number.

It is not a de Polignac number, because 13821601 - 2⁷ = 13821473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13821671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94596 + ... + 94741.

It is an arithmetic number, because the mean of its divisors is an integer number (3502753).

Almost surely, 2^13821601 is an apocalyptic number.

It is an amenable number.

13821601 is a deficient number, since it is larger than the sum of its proper divisors (189411).

13821601 is an equidigital number, since it uses as much as digits as its factorization.

13821601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189410.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 13821601 is about 3717.7413842278. The cubic root of 13821601 is about 239.9861160950.

The spelling of 13821601 in words is "thirteen million, eight hundred twenty-one thousand, six hundred one".