1218112877 has 2 divisors, whose sum is σ = 1218112878. Its totient is φ = 1218112876.

The previous prime is 1218112871. The next prime is 1218112891. The reversal of 1218112877 is 7782118121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 983073316 + 235039561 = 31354^2 + 15331^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218112877 is a prime.

It is a super-2 number, since 2×1218112877² = 2967597962226434258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1218112877.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218112871) 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, 609056438 + 609056439.

It is an arithmetic number, because the mean of its divisors is an integer number (609056439).

Almost surely, 2^1218112877 is an apocalyptic number.

It is an amenable number.

1218112877 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218112877 is an equidigital number, since it uses as much as digits as its factorization.

1218112877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12544, while the sum is 38.

The square root of 1218112877 is about 34901.4738514006. The cubic root of 1218112877 is about 1067.9785040234.

The spelling of 1218112877 in words is "one billion, two hundred eighteen million, one hundred twelve thousand, eight hundred seventy-seven".