1118312643 has 24 divisors (see below), whose sum is σ = 1739439360. Its totient is φ = 637225680.

The previous prime is 1118312639. The next prime is 1118312669. The reversal of 1118312643 is 3462138111.

It is not a de Polignac number, because 1118312643 - 2² = 1118312639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1118312643.

It is not an unprimeable number, because it can be changed into a prime (1118312603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42178 + ... + 63368.

It is an arithmetic number, because the mean of its divisors is an integer number (72476640).

Almost surely, 2^1118312643 is an apocalyptic number.

1118312643 is a deficient number, since it is larger than the sum of its proper divisors (621126717).

1118312643 is a wasteful number, since it uses less digits than its factorization.

1118312643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21567 (or 21560 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 1118312643 is about 33441.1818421538. The cubic root of 1118312643 is about 1037.9770349573.

The spelling of 1118312643 in words is "one billion, one hundred eighteen million, three hundred twelve thousand, six hundred forty-three".