1118209091 has 16 divisors (see below), whose sum is σ = 1173216000. Its totient is φ = 1064534400.

The previous prime is 1118209087. The next prime is 1118209111. The reversal of 1118209091 is 1909028111.

It is a cyclic number.

It is not a de Polignac number, because 1118209091 - 2² = 1118209087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1118209291) 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 15 ways as a sum of consecutive naturals, for example, 502361 + ... + 504581.

It is an arithmetic number, because the mean of its divisors is an integer number (73326000).

Almost surely, 2^1118209091 is an apocalyptic number.

1118209091 is a deficient number, since it is larger than the sum of its proper divisors (55006909).

1118209091 is a wasteful number, since it uses less digits than its factorization.

1118209091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2510.

The product of its (nonzero) digits is 1296, while the sum is 32.

The square root of 1118209091 is about 33439.6335356714. The cubic root of 1118209091 is about 1037.9449962377.

The spelling of 1118209091 in words is "one billion, one hundred eighteen million, two hundred nine thousand, ninety-one".