12431557 has 2 divisors, whose sum is σ = 12431558. Its totient is φ = 12431556.

The previous prime is 12431537. The next prime is 12431561. The reversal of 12431557 is 75513421.

It is a happy number.

12431557 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11655396 + 776161 = 3414^2 + 881^2 .

It is an emirp because it is prime and its reverse (75513421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12431557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12431537) 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, 6215778 + 6215779.

It is an arithmetic number, because the mean of its divisors is an integer number (6215779).

Almost surely, 2^12431557 is an apocalyptic number.

It is an amenable number.

12431557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12431557 is an equidigital number, since it uses as much as digits as its factorization.

12431557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 28.

The square root of 12431557 is about 3525.8413180403. The cubic root of 12431557 is about 231.6550872071.

Adding to 12431557 its reverse (75513421), we get a palindrome (87944978).

The spelling of 12431557 in words is "twelve million, four hundred thirty-one thousand, five hundred fifty-seven".