1218507541 has 2 divisors, whose sum is σ = 1218507542. Its totient is φ = 1218507540.

The previous prime is 1218507527. The next prime is 1218507551. The reversal of 1218507541 is 1457058121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 903303025 + 315204516 = 30055^2 + 17754^2 .

It is a cyclic number.

It is not a de Polignac number, because 1218507541 - 2¹¹ = 1218505493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1218507497 and 1218507506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1218507551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609253770 + 609253771.

It is an arithmetic number, because the mean of its divisors is an integer number (609253771).

Almost surely, 2^1218507541 is an apocalyptic number.

It is an amenable number.

1218507541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218507541 is an equidigital number, since it uses as much as digits as its factorization.

1218507541 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 1218507541 is about 34907.1273667714. The cubic root of 1218507541 is about 1068.0938319112.

The spelling of 1218507541 in words is "one billion, two hundred eighteen million, five hundred seven thousand, five hundred forty-one".