1216220767 has 2 divisors, whose sum is σ = 1216220768. Its totient is φ = 1216220766.

The previous prime is 1216220741. The next prime is 1216220771. The reversal of 1216220767 is 7670226121.

It is a strong prime.

It is an emirp because it is prime and its reverse (7670226121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216220767 - 2²³ = 1207832159 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216220777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608110383 + 608110384.

It is an arithmetic number, because the mean of its divisors is an integer number (608110384).

Almost surely, 2^1216220767 is an apocalyptic number.

1216220767 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216220767 is an equidigital number, since it uses as much as digits as its factorization.

1216220767 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 1216220767 is about 34874.3568686220. The cubic root of 1216220767 is about 1067.4252493331.

Adding to 1216220767 its reverse (7670226121), we get a palindrome (8886446888).

The spelling of 1216220767 in words is "one billion, two hundred sixteen million, two hundred twenty thousand, seven hundred sixty-seven".