13428561 has 4 divisors (see below), whose sum is σ = 17904752. Its totient is φ = 8952372.

The previous prime is 13428559. The next prime is 13428563. The reversal of 13428561 is 16582431.

13428561 is digitally balanced in base 3, 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, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16582431 = 3 ⋅5527477.

It is an interprime number because it is at equal distance from previous prime (13428559) and next prime (13428563).

It is not a de Polignac number, because 13428561 - 2¹ = 13428559 is a prime.

It is the 3665-th Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13428563) by changing a digit.

It is a nontrivial repunit in base 3664.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2238091 + ... + 2238096.

It is an arithmetic number, because the mean of its divisors is an integer number (4476188).

Almost surely, 2^13428561 is an apocalyptic number.

It is an amenable number.

13428561 is a deficient number, since it is larger than the sum of its proper divisors (4476191).

13428561 is an equidigital number, since it uses as much as digits as its factorization.

13428561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4476190.

The product of its digits is 5760, while the sum is 30.

The square root of 13428561 is about 3664.5001023332. The cubic root of 13428561 is about 237.6894060647.

The spelling of 13428561 in words is "thirteen million, four hundred twenty-eight thousand, five hundred sixty-one".