197716819 has 4 divisors (see below), whose sum is σ = 197894944. Its totient is φ = 197538696.

The previous prime is 197716787. The next prime is 197716823. The reversal of 197716819 is 918617791.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 197716819 - 2⁵ = 197716787 is a prime.

It is a super-2 number, since 2×197716819² = 78183881030957522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197716829) 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, 87387 + ... + 89620.

It is an arithmetic number, because the mean of its divisors is an integer number (49473736).

Almost surely, 2^197716819 is an apocalyptic number.

197716819 is a deficient number, since it is larger than the sum of its proper divisors (178125).

197716819 is a wasteful number, since it uses less digits than its factorization.

197716819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178124.

The product of its digits is 190512, while the sum is 49.

The square root of 197716819 is about 14061.1812803903. The cubic root of 197716819 is about 582.5696714665.

The spelling of 197716819 in words is "one hundred ninety-seven million, seven hundred sixteen thousand, eight hundred nineteen".