1219304321 has 2 divisors, whose sum is σ = 1219304322. Its totient is φ = 1219304320.

The previous prime is 1219304297. The next prime is 1219304323. The reversal of 1219304321 is 1234039121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1185838096 + 33466225 = 34436^2 + 5785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1219304321 is a prime.

Together with 1219304323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1219304323) 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, 609652160 + 609652161.

It is an arithmetic number, because the mean of its divisors is an integer number (609652161).

Almost surely, 2^1219304321 is an apocalyptic number.

It is an amenable number.

1219304321 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219304321 is an equidigital number, since it uses as much as digits as its factorization.

1219304321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 1219304321 is about 34918.5383571535. The cubic root of 1219304321 is about 1068.3265894295.

The spelling of 1219304321 in words is "one billion, two hundred nineteen million, three hundred four thousand, three hundred twenty-one".