12543121 has 2 divisors, whose sum is σ = 12543122. Its totient is φ = 12543120.

The previous prime is 12543107. The next prime is 12543131. The reversal of 12543121 is 12134521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7980625 + 4562496 = 2825^2 + 2136^2 .

It is a cyclic number.

It is not a de Polignac number, because 12543121 - 2¹¹ = 12541073 is a prime.

It is a super-3 number, since 3×12543121³ (a number of 22 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12543131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271560 + 6271561.

It is an arithmetic number, because the mean of its divisors is an integer number (6271561).

Almost surely, 2^12543121 is an apocalyptic number.

It is an amenable number.

12543121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12543121 is an equidigital number, since it uses as much as digits as its factorization.

12543121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 240, while the sum is 19.

The square root of 12543121 is about 3541.6268860511. The cubic root of 12543121 is about 232.3460020021.

Adding to 12543121 its reverse (12134521), we get a palindrome (24677642).

The spelling of 12543121 in words is "twelve million, five hundred forty-three thousand, one hundred twenty-one".