12222557 has 2 divisors, whose sum is σ = 12222558. Its totient is φ = 12222556.

The previous prime is 12222547. The next prime is 12222559. The reversal of 12222557 is 75522221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 244036 = 3461^2 + 494^2 .

It is an emirp because it is prime and its reverse (75522221) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12222557 is a prime.

Together with 12222559, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12222559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6111278 + 6111279.

It is an arithmetic number, because the mean of its divisors is an integer number (6111279).

Almost surely, 2^12222557 is an apocalyptic number.

It is an amenable number.

12222557 is a deficient number, since it is larger than the sum of its proper divisors (1).

12222557 is an equidigital number, since it uses as much as digits as its factorization.

12222557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2800, while the sum is 26.

The square root of 12222557 is about 3496.0773732857. The cubic root of 12222557 is about 230.3495441231.

Adding to 12222557 its reverse (75522221), we get a palindrome (87744778).

The spelling of 12222557 in words is "twelve million, two hundred twenty-two thousand, five hundred fifty-seven".