816487197 has 4 divisors (see below), whose sum is σ = 1088649600. Its totient is φ = 544324796.

The previous prime is 816487181. The next prime is 816487219. The reversal of 816487197 is 791784618.

816487197 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 a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 816487197 - 2⁴ = 816487181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (816487297) 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, 136081197 + ... + 136081202.

It is an arithmetic number, because the mean of its divisors is an integer number (272162400).

Almost surely, 2^816487197 is an apocalyptic number.

It is an amenable number.

816487197 is a deficient number, since it is larger than the sum of its proper divisors (272162403).

816487197 is a wasteful number, since it uses less digits than its factorization.

816487197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272162402.

The product of its digits is 677376, while the sum is 51.

The square root of 816487197 is about 28574.2400948827. The cubic root of 816487197 is about 934.6516845318.

The spelling of 816487197 in words is "eight hundred sixteen million, four hundred eighty-seven thousand, one hundred ninety-seven".