12511121 has 6 divisors (see below), whose sum is σ = 14553810. Its totient is φ = 10723776.

The previous prime is 12511117. The next prime is 12511141. The reversal of 12511121 is 12111521.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 261121 = 3500^2 + 511^2 .

It is not a de Polignac number, because 12511121 - 2² = 12511117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12511096 and 12511105.

It is not an unprimeable number, because it can be changed into a prime (12511141) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 127616 + ... + 127713.

It is an arithmetic number, because the mean of its divisors is an integer number (2425635).

Almost surely, 2^12511121 is an apocalyptic number.

It is an amenable number.

12511121 is a deficient number, since it is larger than the sum of its proper divisors (2042689).

12511121 is an equidigital number, since it uses as much as digits as its factorization.

12511121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255343 (or 255336 counting only the distinct ones).

The product of its digits is 20, while the sum is 14.

The square root of 12511121 is about 3537.1063031806. The cubic root of 12511121 is about 232.1482467591.

Adding to 12511121 its reverse (12111521), we get a palindrome (24622642).

The spelling of 12511121 in words is "twelve million, five hundred eleven thousand, one hundred twenty-one".