1222218251 has 2 divisors, whose sum is σ = 1222218252. Its totient is φ = 1222218250.

The previous prime is 1222218233. The next prime is 1222218379. The reversal of 1222218251 is 1528122221.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1222218251 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1222218251.

It is not a weakly prime, because it can be changed into another prime (1222211251) 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, 611109125 + 611109126.

It is an arithmetic number, because the mean of its divisors is an integer number (611109126).

Almost surely, 2^1222218251 is an apocalyptic number.

1222218251 is a deficient number, since it is larger than the sum of its proper divisors (1).

1222218251 is an equidigital number, since it uses as much as digits as its factorization.

1222218251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1280, while the sum is 26.

The square root of 1222218251 is about 34960.2381427816. The cubic root of 1222218251 is about 1069.1769520127.

The spelling of 1222218251 in words is "one billion, two hundred twenty-two million, two hundred eighteen thousand, two hundred fifty-one".