1218341355 has 64 divisors (see below), whose sum is σ = 2435125248. Its totient is φ = 505330560.

The previous prime is 1218341297. The next prime is 1218341357. The reversal of 1218341355 is 5531438121.

It is not a de Polignac number, because 1218341355 - 2¹² = 1218337259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1218341357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1047004 + ... + 1048166.

It is an arithmetic number, because the mean of its divisors is an integer number (38048832).

Almost surely, 2^1218341355 is an apocalyptic number.

1218341355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1218341355 is a deficient number, since it is larger than the sum of its proper divisors (1216783893).

1218341355 is a wasteful number, since it uses less digits than its factorization.

1218341355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2096.

The product of its digits is 14400, while the sum is 33.

The square root of 1218341355 is about 34904.7468834828. The cubic root of 1218341355 is about 1068.0452724219.

Adding to 1218341355 its reverse (5531438121), we get a palindrome (6749779476).

The spelling of 1218341355 in words is "one billion, two hundred eighteen million, three hundred forty-one thousand, three hundred fifty-five".