13305561 has 8 divisors (see below), whose sum is σ = 17757600. Its totient is φ = 8861952.

The previous prime is 13305517. The next prime is 13305563. The reversal of 13305561 is 16550331.

13305561 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13305561 - 2¹¹ = 13303513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13305563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5241 + ... + 7353.

It is an arithmetic number, because the mean of its divisors is an integer number (2219700).

Almost surely, 2^13305561 is an apocalyptic number.

It is an amenable number.

13305561 is a deficient number, since it is larger than the sum of its proper divisors (4452039).

13305561 is a wasteful number, since it uses less digits than its factorization.

13305561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4215.

The product of its (nonzero) digits is 1350, while the sum is 24.

The square root of 13305561 is about 3647.6788509955. The cubic root of 13305561 is about 236.9614671460.

Adding to 13305561 its reverse (16550331), we get a palindrome (29855892).

The spelling of 13305561 in words is "thirteen million, three hundred five thousand, five hundred sixty-one".