12219157 has 2 divisors, whose sum is σ = 12219158. Its totient is φ = 12219156.

The previous prime is 12219133. The next prime is 12219161. The reversal of 12219157 is 75191221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9678321 + 2540836 = 3111^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 12219157 - 2¹¹ = 12217109 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12219127) 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, 6109578 + 6109579.

It is an arithmetic number, because the mean of its divisors is an integer number (6109579).

Almost surely, 2^12219157 is an apocalyptic number.

It is an amenable number.

12219157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12219157 is an equidigital number, since it uses as much as digits as its factorization.

12219157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260, while the sum is 28.

The square root of 12219157 is about 3495.5910802037. The cubic root of 12219157 is about 230.3281830423.

The spelling of 12219157 in words is "twelve million, two hundred nineteen thousand, one hundred fifty-seven".