12312557 has 2 divisors, whose sum is σ = 12312558. Its totient is φ = 12312556.

The previous prime is 12312511. The next prime is 12312571. The reversal of 12312557 is 75521321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11417641 + 894916 = 3379^2 + 946^2 .

It is a cyclic number.

It is not a de Polignac number, because 12312557 - 2⁶ = 12312493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12312457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6156278 + 6156279.

It is an arithmetic number, because the mean of its divisors is an integer number (6156279).

Almost surely, 2^12312557 is an apocalyptic number.

It is an amenable number.

12312557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12312557 is an equidigital number, since it uses as much as digits as its factorization.

12312557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2100, while the sum is 26.

The square root of 12312557 is about 3508.9253340588. The cubic root of 12312557 is about 230.9135499799.

Adding to 12312557 its reverse (75521321), we get a palindrome (87833878).

The spelling of 12312557 in words is "twelve million, three hundred twelve thousand, five hundred fifty-seven".