1218599803 has 2 divisors, whose sum is σ = 1218599804. Its totient is φ = 1218599802.

The previous prime is 1218599771. The next prime is 1218599821. The reversal of 1218599803 is 3089958121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1218599803 - 2⁵ = 1218599771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1218599873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609299901 + 609299902.

It is an arithmetic number, because the mean of its divisors is an integer number (609299902).

Almost surely, 2^1218599803 is an apocalyptic number.

1218599803 is a deficient number, since it is larger than the sum of its proper divisors (1).

1218599803 is an equidigital number, since it uses as much as digits as its factorization.

1218599803 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 155520, while the sum is 46.

The square root of 1218599803 is about 34908.4488770269. The cubic root of 1218599803 is about 1068.1207889284.

The spelling of 1218599803 in words is "one billion, two hundred eighteen million, five hundred ninety-nine thousand, eight hundred three".