1216220939 has 2 divisors, whose sum is σ = 1216220940. Its totient is φ = 1216220938.

The previous prime is 1216220881. The next prime is 1216221001. The reversal of 1216220939 is 9390226121.

It is a weak prime.

It is an emirp because it is prime and its reverse (9390226121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216220939 - 2¹² = 1216216843 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1216220899 and 1216220908.

It is not a weakly prime, because it can be changed into another prime (1216220339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608110469 + 608110470.

It is an arithmetic number, because the mean of its divisors is an integer number (608110470).

Almost surely, 2^1216220939 is an apocalyptic number.

1216220939 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216220939 is an equidigital number, since it uses as much as digits as its factorization.

1216220939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 1216220939 is about 34874.3593346172. The cubic root of 1216220939 is about 1067.4252996521.

The spelling of 1216220939 in words is "one billion, two hundred sixteen million, two hundred twenty thousand, nine hundred thirty-nine".