1218612287 has 16 divisors (see below), whose sum is σ = 1269911040. Its totient is φ = 1168592832.

The previous prime is 1218612259. The next prime is 1218612299. The reversal of 1218612287 is 7822168121.

It is a cyclic number.

It is not a de Polignac number, because 1218612287 - 2⁶ = 1218612223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1218612287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1218612257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558164 + ... + 560342.

It is an arithmetic number, because the mean of its divisors is an integer number (79369440).

Almost surely, 2^1218612287 is an apocalyptic number.

1218612287 is a deficient number, since it is larger than the sum of its proper divisors (51298753).

1218612287 is a wasteful number, since it uses less digits than its factorization.

1218612287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462.

The product of its digits is 21504, while the sum is 38.

The square root of 1218612287 is about 34908.6276871492. The cubic root of 1218612287 is about 1068.1244363863.

The spelling of 1218612287 in words is "one billion, two hundred eighteen million, six hundred twelve thousand, two hundred eighty-seven".