1216300009 has 2 divisors, whose sum is σ = 1216300010. Its totient is φ = 1216300008.

The previous prime is 1216299989. The next prime is 1216300013. The reversal of 1216300009 is 9000036121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1138860009 + 77440000 = 33747^2 + 8800^2 .

It is an emirp because it is prime and its reverse (9000036121) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1216300009 is a prime.

It is not a weakly prime, because it can be changed into another prime (1216300039) 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, 608150004 + 608150005.

It is an arithmetic number, because the mean of its divisors is an integer number (608150005).

Almost surely, 2^1216300009 is an apocalyptic number.

It is an amenable number.

1216300009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216300009 is an equidigital number, since it uses as much as digits as its factorization.

1216300009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 1216300009 is about 34875.4929570895. The cubic root of 1216300009 is about 1067.4484312742.

The spelling of 1216300009 in words is "one billion, two hundred sixteen million, three hundred thousand, nine".