1118312613 has 18 divisors (see below), whose sum is σ = 1775541222. Its totient is φ = 677764560.

The previous prime is 1118312603. The next prime is 1118312617. The reversal of 1118312613 is 3162138111.

1118312613 is a `hidden beast` number, since 1 + 1 + 18 + 31 + 2 + 613 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1108690209 + 9622404 = 33297^2 + 3102^2 .

It is not a de Polignac number, because 1118312613 - 2¹⁴ = 1118296229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118312617) 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 17 ways as a sum of consecutive naturals, for example, 512370 + ... + 514547.

It is an arithmetic number, because the mean of its divisors is an integer number (98641179).

Almost surely, 2^1118312613 is an apocalyptic number.

It is an amenable number.

1118312613 is a deficient number, since it is larger than the sum of its proper divisors (657228609).

1118312613 is a wasteful number, since it uses less digits than its factorization.

1118312613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1026945 (or 1026931 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 1118312613 is about 33441.1813936051. The cubic root of 1118312613 is about 1037.9770256757.

The spelling of 1118312613 in words is "one billion, one hundred eighteen million, three hundred twelve thousand, six hundred thirteen".