1118938091 has 4 divisors (see below), whose sum is σ = 1128840312. Its totient is φ = 1109035872.

The previous prime is 1118938043. The next prime is 1118938099. The reversal of 1118938091 is 1908398111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1908398111 = 103 ⋅18528137.

It is a cyclic number.

It is not a de Polignac number, because 1118938091 - 2¹⁴ = 1118921707 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1118938099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4950941 + ... + 4951166.

It is an arithmetic number, because the mean of its divisors is an integer number (282210078).

Almost surely, 2^1118938091 is an apocalyptic number.

1118938091 is a deficient number, since it is larger than the sum of its proper divisors (9902221).

1118938091 is an equidigital number, since it uses as much as digits as its factorization.

1118938091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9902220.

The product of its (nonzero) digits is 15552, while the sum is 41.

The square root of 1118938091 is about 33450.5319987590. The cubic root of 1118938091 is about 1038.1705049064.

The spelling of 1118938091 in words is "one billion, one hundred eighteen million, nine hundred thirty-eight thousand, ninety-one".