191981004 has 12 divisors (see below), whose sum is σ = 447955704. Its totient is φ = 63993664.

The previous prime is 191980967. The next prime is 191981033. The reversal of 191981004 is 400189191.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7999197 + ... + 7999220.

It is an arithmetic number, because the mean of its divisors is an integer number (37329642).

Almost surely, 2^191981004 is an apocalyptic number.

It is an amenable number.

191981004 is an abundant number, since it is smaller than the sum of its proper divisors (255974700).

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

191981004 is a wasteful number, since it uses less digits than its factorization.

191981004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15998424 (or 15998422 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 33.

The square root of 191981004 is about 13855.7209844887. The cubic root of 191981004 is about 576.8808018199.

It can be divided in two parts, 19198 and 1004, that added together give a palindrome (20202).

The spelling of 191981004 in words is "one hundred ninety-one million, nine hundred eighty-one thousand, four".