1218963199 has 4 divisors (see below), whose sum is σ = 1219066480. Its totient is φ = 1218859920.

The previous prime is 1218963197. The next prime is 1218963289. The reversal of 1218963199 is 9913698121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1218963199 - 2¹ = 1218963197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218963197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31254 + ... + 58435.

It is an arithmetic number, because the mean of its divisors is an integer number (304766620).

Almost surely, 2^1218963199 is an apocalyptic number.

1218963199 is a deficient number, since it is larger than the sum of its proper divisors (103281).

1218963199 is an equidigital number, since it uses as much as digits as its factorization.

1218963199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103280.

The product of its digits is 209952, while the sum is 49.

The square root of 1218963199 is about 34913.6534753956. The cubic root of 1218963199 is about 1068.2269523695.

The spelling of 1218963199 in words is "one billion, two hundred eighteen million, nine hundred sixty-three thousand, one hundred ninety-nine".