1991833194 has 32 divisors (see below), whose sum is σ = 4515900480. Its totient is φ = 580614912.

The previous prime is 1991833171. The next prime is 1991833201. The reversal of 1991833194 is 4913381991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 670527 + ... + 673490.

It is an arithmetic number, because the mean of its divisors is an integer number (141121890).

Almost surely, 2^1991833194 is an apocalyptic number.

1991833194 is an abundant number, since it is smaller than the sum of its proper divisors (2524067286).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991833194 is a wasteful number, since it uses less digits than its factorization.

1991833194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1344054.

The product of its digits is 209952, while the sum is 48.

The square root of 1991833194 is about 44629.9584808232. The cubic root of 1991833194 is about 1258.2037885478.

The spelling of 1991833194 in words is "one billion, nine hundred ninety-one million, eight hundred thirty-three thousand, one hundred ninety-four".