1218112871 has 2 divisors, whose sum is σ = 1218112872. Its totient is φ = 1218112870.

The previous prime is 1218112859. The next prime is 1218112877. The reversal of 1218112871 is 1782118121.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218112871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218112877) 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, 609056435 + 609056436.

It is an arithmetic number, because the mean of its divisors is an integer number (609056436).

Almost surely, 2^1218112871 is an apocalyptic number.

1218112871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218112871 is an equidigital number, since it uses as much as digits as its factorization.

1218112871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1792, while the sum is 32.

The square root of 1218112871 is about 34901.4737654443. The cubic root of 1218112871 is about 1067.9785022699.

It can be divided in two parts, 12181 and 12871, that added together give a palindrome (25052).

The spelling of 1218112871 in words is "one billion, two hundred eighteen million, one hundred twelve thousand, eight hundred seventy-one".