816231197 has 4 divisors (see below), whose sum is σ = 824312796. Its totient is φ = 808149600.

The previous prime is 816231173. The next prime is 816231257. The reversal of 816231197 is 791132618.

816231197 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 791132618 = 2 ⋅395566309.

It can be written as a sum of positive squares in 2 ways, for example, as 766514596 + 49716601 = 27686^2 + 7051^2 .

It is a cyclic number.

It is not a de Polignac number, because 816231197 - 2²² = 812036893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 816231197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816234197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4040648 + ... + 4040849.

It is an arithmetic number, because the mean of its divisors is an integer number (206078199).

Almost surely, 2^816231197 is an apocalyptic number.

It is an amenable number.

816231197 is a deficient number, since it is larger than the sum of its proper divisors (8081599).

816231197 is a wasteful number, since it uses less digits than its factorization.

816231197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8081598.

The product of its digits is 18144, while the sum is 38.

The square root of 816231197 is about 28569.7601845028. The cubic root of 816231197 is about 934.5539912904.

The spelling of 816231197 in words is "eight hundred sixteen million, two hundred thirty-one thousand, one hundred ninety-seven".