1108408891 has 4 divisors (see below), whose sum is σ = 1173609432. Its totient is φ = 1043208352.

The previous prime is 1108408811. The next prime is 1108408897. The reversal of 1108408891 is 1988048011.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1108408891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1108408897) 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, 32600245 + ... + 32600278.

It is an arithmetic number, because the mean of its divisors is an integer number (293402358).

Almost surely, 2^1108408891 is an apocalyptic number.

1108408891 is a deficient number, since it is larger than the sum of its proper divisors (65200541).

1108408891 is an equidigital number, since it uses as much as digits as its factorization.

1108408891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65200540.

The product of its (nonzero) digits is 18432, while the sum is 40.

The square root of 1108408891 is about 33292.7753574255. The cubic root of 1108408891 is about 1034.9038444436.

The spelling of 1108408891 in words is "one billion, one hundred eight million, four hundred eight thousand, eight hundred ninety-one".