13644331 has 2 divisors, whose sum is σ = 13644332. Its totient is φ = 13644330.

The previous prime is 13644329. The next prime is 13644347. The reversal of 13644331 is 13344631.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13644331 - 2¹ = 13644329 is a prime.

It is a super-2 number, since 2×13644331² = 372335536875122, which contains 22 as substring.

Together with 13644329, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13644296 and 13644305.

It is not a weakly prime, because it can be changed into another prime (13644361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822165 + 6822166.

It is an arithmetic number, because the mean of its divisors is an integer number (6822166).

Almost surely, 2^13644331 is an apocalyptic number.

13644331 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644331 is an equidigital number, since it uses as much as digits as its factorization.

13644331 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 25.

The square root of 13644331 is about 3693.8233579856. The cubic root of 13644331 is about 238.9557115230.

Adding to 13644331 its reverse (13344631), we get a palindrome (26988962).

The spelling of 13644331 in words is "thirteen million, six hundred forty-four thousand, three hundred thirty-one".