12122557 has 2 divisors, whose sum is σ = 12122558. Its totient is φ = 12122556.

The previous prime is 12122549. The next prime is 12122563. The reversal of 12122557 is 75522121.

12122557 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., 7365796 + 4756761 = 2714^2 + 2181^2 .

It is a cyclic number.

It is not a de Polignac number, because 12122557 - 2³ = 12122549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12122507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061278 + 6061279.

It is an arithmetic number, because the mean of its divisors is an integer number (6061279).

Almost surely, 2^12122557 is an apocalyptic number.

It is an amenable number.

12122557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12122557 is an equidigital number, since it uses as much as digits as its factorization.

12122557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1400, while the sum is 25.

The square root of 12122557 is about 3481.7462572680. The cubic root of 12122557 is about 229.7196142210.

Adding to 12122557 its reverse (75522121), we get a palindrome (87644678).

The spelling of 12122557 in words is "twelve million, one hundred twenty-two thousand, five hundred fifty-seven".