12531521 has 2 divisors, whose sum is σ = 12531522. Its totient is φ = 12531520.

The previous prime is 12531517. The next prime is 12531529. The reversal of 12531521 is 12513521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11458225 + 1073296 = 3385^2 + 1036^2 .

It is a cyclic number.

It is not a de Polignac number, because 12531521 - 2² = 12531517 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 12531493 and 12531502.

It is not a weakly prime, because it can be changed into another prime (12531529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6265760 + 6265761.

It is an arithmetic number, because the mean of its divisors is an integer number (6265761).

Almost surely, 2^12531521 is an apocalyptic number.

It is an amenable number.

12531521 is a deficient number, since it is larger than the sum of its proper divisors (1).

12531521 is an equidigital number, since it uses as much as digits as its factorization.

12531521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 300, while the sum is 20.

The square root of 12531521 is about 3539.9888417903. The cubic root of 12531521 is about 232.2743546318.

The spelling of 12531521 in words is "twelve million, five hundred thirty-one thousand, five hundred twenty-one".