1216300061 has 2 divisors, whose sum is σ = 1216300062. Its totient is φ = 1216300060.

The previous prime is 1216300039. The next prime is 1216300069. The reversal of 1216300061 is 1600036121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1215916900 + 383161 = 34870^2 + 619^2 .

It is an emirp because it is prime and its reverse (1600036121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1216300061 - 2¹⁰ = 1216299037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1216300069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608150030 + 608150031.

It is an arithmetic number, because the mean of its divisors is an integer number (608150031).

Almost surely, 2^1216300061 is an apocalyptic number.

It is an amenable number.

1216300061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1216300061 is an equidigital number, since it uses as much as digits as its factorization.

1216300061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1216300061 is about 34875.4937025987. The cubic root of 1216300061 is about 1067.4484464863.

Adding to 1216300061 its reverse (1600036121), we get a palindrome (2816336182).

The spelling of 1216300061 in words is "one billion, two hundred sixteen million, three hundred thousand, sixty-one".