1218127481 has 2 divisors, whose sum is σ = 1218127482. Its totient is φ = 1218127480.

The previous prime is 1218127451. The next prime is 1218127489. The reversal of 1218127481 is 1847218121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 766182400 + 451945081 = 27680^2 + 21259^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218127481 is a prime.

It is a super-2 number, since 2×1218127481² = 2967669119934810722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1218127489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609063740 + 609063741.

It is an arithmetic number, because the mean of its divisors is an integer number (609063741).

Almost surely, 2^1218127481 is an apocalyptic number.

It is an amenable number.

1218127481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218127481 is an equidigital number, since it uses as much as digits as its factorization.

1218127481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7168, while the sum is 35.

The square root of 1218127481 is about 34901.6830682992. The cubic root of 1218127481 is about 1067.9827720175.

The spelling of 1218127481 in words is "one billion, two hundred eighteen million, one hundred twenty-seven thousand, four hundred eighty-one".