1218831899 has 8 divisors (see below), whose sum is σ = 1230617232. Its totient is φ = 1207064320.

The previous prime is 1218831877. The next prime is 1218831959. The reversal of 1218831899 is 9981388121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1218831899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1218831839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163712 + ... + 170994.

It is an arithmetic number, because the mean of its divisors is an integer number (153827154).

Almost surely, 2^1218831899 is an apocalyptic number.

1218831899 is a deficient number, since it is larger than the sum of its proper divisors (11785333).

1218831899 is a wasteful number, since it uses less digits than its factorization.

1218831899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8877.

The product of its digits is 248832, while the sum is 50.

The square root of 1218831899 is about 34911.7730715585. The cubic root of 1218831899 is about 1068.1885964850.

The spelling of 1218831899 in words is "one billion, two hundred eighteen million, eight hundred thirty-one thousand, eight hundred ninety-nine".