1218016897 has 2 divisors, whose sum is σ = 1218016898. Its totient is φ = 1218016896.

The previous prime is 1218016871. The next prime is 1218016927. The reversal of 1218016897 is 7986108121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 813162256 + 404854641 = 28516^2 + 20121^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218016897 - 2¹⁹ = 1217492609 is a prime.

It is a super-2 number, since 2×1218016897² = 2967130322755017218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1218016837) 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, 609008448 + 609008449.

It is an arithmetic number, because the mean of its divisors is an integer number (609008449).

Almost surely, 2^1218016897 is an apocalyptic number.

It is an amenable number.

1218016897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218016897 is an equidigital number, since it uses as much as digits as its factorization.

1218016897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 43.

The square root of 1218016897 is about 34900.0988107484. The cubic root of 1218016897 is about 1067.9504531831.

The spelling of 1218016897 in words is "one billion, two hundred eighteen million, sixteen thousand, eight hundred ninety-seven".