1118344491 has 24 divisors (see below), whose sum is σ = 1764172800. Its totient is φ = 677041200.

The previous prime is 1118344481. The next prime is 1118344517. The reversal of 1118344491 is 1944438111.

It is not a de Polignac number, because 1118344491 - 2⁵ = 1118344459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1118344411) 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 23 ways as a sum of consecutive naturals, for example, 92410 + ... + 103808.

It is an arithmetic number, because the mean of its divisors is an integer number (73507200).

Almost surely, 2^1118344491 is an apocalyptic number.

1118344491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1118344491 is a deficient number, since it is larger than the sum of its proper divisors (645828309).

1118344491 is a wasteful number, since it uses less digits than its factorization.

1118344491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12407 (or 12404 counting only the distinct ones).

The product of its digits is 13824, while the sum is 36.

The square root of 1118344491 is about 33441.6580181067. The cubic root of 1118344491 is about 1037.9868882481.

The spelling of 1118344491 in words is "one billion, one hundred eighteen million, three hundred forty-four thousand, four hundred ninety-one".