12561121 has 4 divisors (see below), whose sum is σ = 12607744. Its totient is φ = 12514500.

The previous prime is 12561103. The next prime is 12561127. The reversal of 12561121 is 12116521.

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.

It is a cyclic number.

It is not a de Polignac number, because 12561121 - 2⁷ = 12560993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12561127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22905 + ... + 23446.

It is an arithmetic number, because the mean of its divisors is an integer number (3151936).

Almost surely, 2^12561121 is an apocalyptic number.

It is an amenable number.

12561121 is a deficient number, since it is larger than the sum of its proper divisors (46623).

12561121 is an equidigital number, since it uses as much as digits as its factorization.

12561121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46622.

The product of its digits is 120, while the sum is 19.

The square root of 12561121 is about 3544.1671800297. The cubic root of 12561121 is about 232.4570915536.

Adding to 12561121 its reverse (12116521), we get a palindrome (24677642).

The spelling of 12561121 in words is "twelve million, five hundred sixty-one thousand, one hundred twenty-one".