12411521 has 2 divisors, whose sum is σ = 12411522. Its totient is φ = 12411520.

The previous prime is 12411517. The next prime is 12411523. The reversal of 12411521 is 12511421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7398400 + 5013121 = 2720^2 + 2239^2 .

It is a cyclic number.

It is not a de Polignac number, because 12411521 - 2² = 12411517 is a prime.

Together with 12411523, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12411521.

It is not a weakly prime, because it can be changed into another prime (12411523) 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 as a sum of consecutive naturals, namely, 6205760 + 6205761.

It is an arithmetic number, because the mean of its divisors is an integer number (6205761).

Almost surely, 2^12411521 is an apocalyptic number.

It is an amenable number.

12411521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12411521 is an equidigital number, since it uses as much as digits as its factorization.

12411521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80, while the sum is 17.

The square root of 12411521 is about 3522.9988646038. The cubic root of 12411521 is about 231.5305670818.

Adding to 12411521 its reverse (12511421), we get a palindrome (24922942).

The spelling of 12411521 in words is "twelve million, four hundred eleven thousand, five hundred twenty-one".