13012561 has 8 divisors (see below), whose sum is σ = 13749120. Its totient is φ = 12295248.

The previous prime is 13012553. The next prime is 13012579. The reversal of 13012561 is 16521031.

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

It is a cyclic number.

It is not a de Polignac number, because 13012561 - 2³ = 13012553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13012061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3411 + ... + 6136.

It is an arithmetic number, because the mean of its divisors is an integer number (1718640).

Almost surely, 2^13012561 is an apocalyptic number.

It is an amenable number.

13012561 is a deficient number, since it is larger than the sum of its proper divisors (736559).

13012561 is an equidigital number, since it uses as much as digits as its factorization.

13012561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9623.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 13012561 is about 3607.2927521897. The cubic root of 13012561 is about 235.2091754581.

Adding to 13012561 its reverse (16521031), we get a palindrome (29533592).

The spelling of 13012561 in words is "thirteen million, twelve thousand, five hundred sixty-one".