1108391 has 4 divisors (see below), whose sum is σ = 1116984. Its totient is φ = 1099800.

The previous prime is 1108369. The next prime is 1108397. The reversal of 1108391 is 1938011.

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

It is a cyclic number.

It is not a de Polignac number, because 1108391 - 2¹⁸ = 846247 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 (1108397) 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 3 ways as a sum of consecutive naturals, for example, 4100 + ... + 4361.

It is an arithmetic number, because the mean of its divisors is an integer number (279246).

2^1108391 is an apocalyptic number.

1108391 is a deficient number, since it is larger than the sum of its proper divisors (8593).

1108391 is an equidigital number, since it uses as much as digits as its factorization.

1108391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8592.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 1108391 is about 1052.8015007588. The cubic root of 1108391 is about 103.4898276232.

The spelling of 1108391 in words is "one million, one hundred eight thousand, three hundred ninety-one".