1218903899 has 2 divisors, whose sum is σ = 1218903900. Its totient is φ = 1218903898.

The previous prime is 1218903863. The next prime is 1218903949. The reversal of 1218903899 is 9983098121.

It is a happy number.

It is an a-pointer prime, because the next prime (1218903949) can be obtained adding 1218903899 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1218903899 - 2⁸ = 1218903643 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218903809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609451949 + 609451950.

It is an arithmetic number, because the mean of its divisors is an integer number (609451950).

Almost surely, 2^1218903899 is an apocalyptic number.

1218903899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218903899 is an equidigital number, since it uses as much as digits as its factorization.

1218903899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 50.

The square root of 1218903899 is about 34912.8042271027. The cubic root of 1218903899 is about 1068.2096297559.

The spelling of 1218903899 in words is "one billion, two hundred eighteen million, nine hundred three thousand, eight hundred ninety-nine".