1118910991 has 8 divisors (see below), whose sum is σ = 1221591168. Its totient is φ = 1016391000.

The previous prime is 1118910979. The next prime is 1118910997. The reversal of 1118910991 is 1990198111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1118910991 - 2⁵ = 1118910959 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 (1118910997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25195 + ... + 53596.

It is an arithmetic number, because the mean of its divisors is an integer number (152698896).

Almost surely, 2^1118910991 is an apocalyptic number.

1118910991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1118910991 is a deficient number, since it is larger than the sum of its proper divisors (102680177).

1118910991 is a wasteful number, since it uses less digits than its factorization.

1118910991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80093.

The product of its (nonzero) digits is 5832, while the sum is 40.

The square root of 1118910991 is about 33450.1269205365. The cubic root of 1118910991 is about 1038.1621235527.

The spelling of 1118910991 in words is "one billion, one hundred eighteen million, nine hundred ten thousand, nine hundred ninety-one".