1091191198 has 16 divisors (see below), whose sum is σ = 1716796224. Its totient is φ = 519553440.

The previous prime is 1091191187. The next prime is 1091191201. The reversal of 1091191198 is 8911911901.

It is a self number, because there is not a number n which added to its sum of digits gives 1091191198.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 153393 + ... + 160348.

It is an arithmetic number, because the mean of its divisors is an integer number (107299764).

Almost surely, 2^1091191198 is an apocalyptic number.

1091191198 is a deficient number, since it is larger than the sum of its proper divisors (625605026).

1091191198 is a wasteful number, since it uses less digits than its factorization.

1091191198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 313827.

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

The square root of 1091191198 is about 33033.1832859021. The cubic root of 1091191198 is about 1029.5172268597.

The spelling of 1091191198 in words is "one billion, ninety-one million, one hundred ninety-one thousand, one hundred ninety-eight".