13361643 has 24 divisors (see below), whose sum is σ = 21329568. Its totient is φ = 8017152.

The previous prime is 13361639. The next prime is 13361669. The reversal of 13361643 is 34616331.

13361643 is a `hidden beast` number, since 1 + 3 + 3 + 616 + 43 = 666.

13361643 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13361643 - 2² = 13361639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13361603) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1621 + ... + 5417.

It is an arithmetic number, because the mean of its divisors is an integer number (888732).

Almost surely, 2^13361643 is an apocalyptic number.

13361643 is a deficient number, since it is larger than the sum of its proper divisors (7967925).

13361643 is a wasteful number, since it uses less digits than its factorization.

13361643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3843 (or 3840 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 13361643 is about 3655.3581219902. The cubic root of 13361643 is about 237.2939257695.

Adding to 13361643 its reverse (34616331), we get a palindrome (47977974).

It can be divided in two parts, 133 and 61643, that added together give a triangular number (61776 = T₃₅₁).

The spelling of 13361643 in words is "thirteen million, three hundred sixty-one thousand, six hundred forty-three".