1218507647 has 12 divisors (see below), whose sum is σ = 1418089320. Its totient is φ = 1043962416.

The previous prime is 1218507629. The next prime is 1218507649. The reversal of 1218507647 is 7467058121.

It is not a de Polignac number, because 1218507647 - 2¹² = 1218503551 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 (1218507649) 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 11 ways as a sum of consecutive naturals, for example, 143813 + ... + 152049.

It is an arithmetic number, because the mean of its divisors is an integer number (118174110).

Almost surely, 2^1218507647 is an apocalyptic number.

1218507647 is a deficient number, since it is larger than the sum of its proper divisors (199581673).

1218507647 is an equidigital number, since it uses as much as digits as its factorization.

1218507647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11270 (or 11263 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 1218507647 is about 34907.1288850859. The cubic root of 1218507647 is about 1068.0938628830.

The spelling of 1218507647 in words is "one billion, two hundred eighteen million, five hundred seven thousand, six hundred forty-seven".