819191272 has 24 divisors (see below), whose sum is σ = 1548159750. Its totient is φ = 406355904.

The previous prime is 819191227. The next prime is 819191273. The reversal of 819191272 is 272191918.

It can be written as a sum of positive squares in 3 ways, for example, as 606439876 + 212751396 = 24626^2 + 14586^2 .

It is not an unprimeable number, because it can be changed into a prime (819191273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 987754 + ... + 988582.

Almost surely, 2^819191272 is an apocalyptic number.

It is an amenable number.

819191272 is a deficient number, since it is larger than the sum of its proper divisors (728968478).

819191272 is an equidigital number, since it uses as much as digits as its factorization.

819191272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 980 counting only the distinct ones).

The product of its digits is 18144, while the sum is 40.

The square root of 819191272 is about 28621.5176397060. The cubic root of 819191272 is about 935.6823531920.

The spelling of 819191272 in words is "eight hundred nineteen million, one hundred ninety-one thousand, two hundred seventy-two".