1218111263 has 2 divisors, whose sum is σ = 1218111264. Its totient is φ = 1218111262.

The previous prime is 1218111259. The next prime is 1218111281. The reversal of 1218111263 is 3621118121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1218111263 - 2² = 1218111259 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218111253) 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, 609055631 + 609055632.

It is an arithmetic number, because the mean of its divisors is an integer number (609055632).

Almost surely, 2^1218111263 is an apocalyptic number.

1218111263 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218111263 is an equidigital number, since it uses as much as digits as its factorization.

1218111263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 26.

The square root of 1218111263 is about 34901.4507291602. The cubic root of 1218111263 is about 1067.9780323325.

Adding to 1218111263 its reverse (3621118121), we get a palindrome (4839229384).

The spelling of 1218111263 in words is "one billion, two hundred eighteen million, one hundred eleven thousand, two hundred sixty-three".