12013561 has 8 divisors (see below), whose sum is σ = 13768704. Its totient is φ = 10268160.

The previous prime is 12013553. The next prime is 12013571. The reversal of 12013561 is 16531021.

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

It is not a de Polignac number, because 12013561 - 2³ = 12013553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12013501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 441 + ... + 4921.

It is an arithmetic number, because the mean of its divisors is an integer number (1721088).

Almost surely, 2^12013561 is an apocalyptic number.

It is an amenable number.

12013561 is a deficient number, since it is larger than the sum of its proper divisors (1755143).

12013561 is an equidigital number, since it uses as much as digits as its factorization.

12013561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4871.

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

The square root of 12013561 is about 3466.0584242046. The cubic root of 12013561 is about 229.0290575435.

Adding to 12013561 its reverse (16531021), we get a palindrome (28544582).

The spelling of 12013561 in words is "twelve million, thirteen thousand, five hundred sixty-one".