1218315061 has 2 divisors, whose sum is σ = 1218315062. Its totient is φ = 1218315060.

The previous prime is 1218315029. The next prime is 1218315073. The reversal of 1218315061 is 1605138121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 617771025 + 600544036 = 24855^2 + 24506^2 .

It is an emirp because it is prime and its reverse (1605138121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1218315061 - 2⁵ = 1218315029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218315361) 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, 609157530 + 609157531.

It is an arithmetic number, because the mean of its divisors is an integer number (609157531).

Almost surely, 2^1218315061 is an apocalyptic number.

It is an amenable number.

1218315061 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218315061 is an equidigital number, since it uses as much as digits as its factorization.

1218315061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 1218315061 is about 34904.3702278096. The cubic root of 1218315061 is about 1068.0375889200.

The spelling of 1218315061 in words is "one billion, two hundred eighteen million, three hundred fifteen thousand, sixty-one".