1091198 has 4 divisors (see below), whose sum is σ = 1636800. Its totient is φ = 545598.

The previous prime is 1091191. The next prime is 1091219. The reversal of 1091198 is 8911901.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1091198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1091191) 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 as a sum of consecutive naturals, namely, 272798 + ... + 272801.

It is an arithmetic number, because the mean of its divisors is an integer number (409200).

2^1091198 is an apocalyptic number.

1091198 is a deficient number, since it is larger than the sum of its proper divisors (545602).

1091198 is an equidigital number, since it uses as much as digits as its factorization.

1091198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545601.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1091198 is about 1044.6042312761. The cubic root of 1091198 is about 102.9519366039.

The spelling of 1091198 in words is "one million, ninety-one thousand, one hundred ninety-eight".