1118995813 has 8 divisors (see below), whose sum is σ = 1212205400. Its totient is φ = 1032917184.

The previous prime is 1118995771. The next prime is 1118995817. The reversal of 1118995813 is 3185998111.

It can be written as a sum of positive squares in 4 ways, for example, as 600887169 + 518108644 = 24513^2 + 22762^2 .

It is not a de Polignac number, because 1118995813 - 2²⁹ = 582124901 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 (1118995817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 252468 + ... + 256861.

It is an arithmetic number, because the mean of its divisors is an integer number (151525675).

Almost surely, 2^1118995813 is an apocalyptic number.

1118995813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1118995813 is a deficient number, since it is larger than the sum of its proper divisors (93209587).

1118995813 is an frugal number, since it uses more digits than its factorization.

1118995813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509368 (or 509342 counting only the distinct ones).

The product of its digits is 77760, while the sum is 46.

The square root of 1118995813 is about 33451.3947840744. The cubic root of 1118995813 is about 1038.1883564295.

The spelling of 1118995813 in words is "one billion, one hundred eighteen million, nine hundred ninety-five thousand, eight hundred thirteen".