1224214157 has 2 divisors, whose sum is σ = 1224214158. Its totient is φ = 1224214156.

The previous prime is 1224214093. The next prime is 1224214177. The reversal of 1224214157 is 7514124221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 823173481 + 401040676 = 28691^2 + 20026^2 .

It is an emirp because it is prime and its reverse (7514124221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1224214157 - 2⁶ = 1224214093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1224214177) 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, 612107078 + 612107079.

It is an arithmetic number, because the mean of its divisors is an integer number (612107079).

Almost surely, 2^1224214157 is an apocalyptic number.

It is an amenable number.

1224214157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224214157 is an equidigital number, since it uses as much as digits as its factorization.

1224214157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4480, while the sum is 29.

The square root of 1224214157 is about 34988.7718704158. The cubic root of 1224214157 is about 1069.7586310312.

Adding to 1224214157 its reverse (7514124221), we get a palindrome (8738338378).

The spelling of 1224214157 in words is "one billion, two hundred twenty-four million, two hundred fourteen thousand, one hundred fifty-seven".