1991196272 has 20 divisors (see below), whose sum is σ = 4154708040. Its totient is φ = 919013568.

The previous prime is 1991196271. The next prime is 1991196287. The reversal of 1991196272 is 2726911991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1991196271) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4786322 + ... + 4786737.

It is an arithmetic number, because the mean of its divisors is an integer number (207735402).

Almost surely, 2^1991196272 is an apocalyptic number.

It is an amenable number.

1991196272 is an abundant number, since it is smaller than the sum of its proper divisors (2163511768).

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

1991196272 is a wasteful number, since it uses less digits than its factorization.

1991196272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9573080 (or 9573074 counting only the distinct ones).

The product of its digits is 122472, while the sum is 47.

The square root of 1991196272 is about 44622.8223222153. The cubic root of 1991196272 is about 1258.0696636775.

The spelling of 1991196272 in words is "one billion, nine hundred ninety-one million, one hundred ninety-six thousand, two hundred seventy-two".