1218028313 has 2 divisors, whose sum is σ = 1218028314. Its totient is φ = 1218028312.

The previous prime is 1218028303. The next prime is 1218028327. The reversal of 1218028313 is 3138208121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1185218329 + 32809984 = 34427^2 + 5728^2 .

It is an emirp because it is prime and its reverse (3138208121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1218028313 - 2¹⁶ = 1217962777 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1218028303) 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, 609014156 + 609014157.

It is an arithmetic number, because the mean of its divisors is an integer number (609014157).

Almost surely, 2^1218028313 is an apocalyptic number.

It is an amenable number.

1218028313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218028313 is an equidigital number, since it uses as much as digits as its factorization.

1218028313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1218028313 is about 34900.2623629107. The cubic root of 1218028313 is about 1067.9537896678.

The spelling of 1218028313 in words is "one billion, two hundred eighteen million, twenty-eight thousand, three hundred thirteen".