1218775211 has 2 divisors, whose sum is σ = 1218775212. Its totient is φ = 1218775210.

The previous prime is 1218775193. The next prime is 1218775219. The reversal of 1218775211 is 1125778121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1218775211 - 2⁶ = 1218775147 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218775219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609387605 + 609387606.

It is an arithmetic number, because the mean of its divisors is an integer number (609387606).

Almost surely, 2^1218775211 is an apocalyptic number.

1218775211 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218775211 is an equidigital number, since it uses as much as digits as its factorization.

1218775211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7840, while the sum is 35.

The square root of 1218775211 is about 34910.9611869968. The cubic root of 1218775211 is about 1068.1720357069.

The spelling of 1218775211 in words is "one billion, two hundred eighteen million, seven hundred seventy-five thousand, two hundred eleven".