1218541057 has 2 divisors, whose sum is σ = 1218541058. Its totient is φ = 1218541056.

The previous prime is 1218541031. The next prime is 1218541069. The reversal of 1218541057 is 7501458121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1047428496 + 171112561 = 32364^2 + 13081^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218541057 - 2⁷ = 1218540929 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218548057) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609270528 + 609270529.

It is an arithmetic number, because the mean of its divisors is an integer number (609270529).

Almost surely, 2^1218541057 is an apocalyptic number.

It is an amenable number.

1218541057 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218541057 is an equidigital number, since it uses as much as digits as its factorization.

1218541057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11200, while the sum is 34.

The square root of 1218541057 is about 34907.6074373481. The cubic root of 1218541057 is about 1068.1036247393.

Adding to 1218541057 its reverse (7501458121), we get a palindrome (8719999178).

The spelling of 1218541057 in words is "one billion, two hundred eighteen million, five hundred forty-one thousand, fifty-seven".