1218111345 has 64 divisors (see below), whose sum is σ = 2402611200. Its totient is φ = 580547520.

The previous prime is 1218111343. The next prime is 1218111359. The reversal of 1218111345 is 5431118121.

It is not a de Polignac number, because 1218111345 - 2¹ = 1218111343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1218111343) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 80664 + ... + 94566.

It is an arithmetic number, because the mean of its divisors is an integer number (37540800).

Almost surely, 2^1218111345 is an apocalyptic number.

1218111345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1218111345 is a deficient number, since it is larger than the sum of its proper divisors (1184499855).

1218111345 is a wasteful number, since it uses less digits than its factorization.

1218111345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13987 (or 13981 counting only the distinct ones).

The product of its digits is 960, while the sum is 27.

The square root of 1218111345 is about 34901.4519038965. The cubic root of 1218111345 is about 1067.9780562970.

Adding to 1218111345 its reverse (5431118121), we get a palindrome (6649229466).

The spelling of 1218111345 in words is "one billion, two hundred eighteen million, one hundred eleven thousand, three hundred forty-five".