643219197 has 8 divisors (see below), whose sum is σ = 871685280. Its totient is φ = 421782960.

The previous prime is 643219189. The next prime is 643219201. The reversal of 643219197 is 791912346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643219197 - 2³ = 643219189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643219147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1757247 + ... + 1757612.

It is an arithmetic number, because the mean of its divisors is an integer number (108960660).

Almost surely, 2^643219197 is an apocalyptic number.

It is an amenable number.

643219197 is a deficient number, since it is larger than the sum of its proper divisors (228466083).

643219197 is a wasteful number, since it uses less digits than its factorization.

643219197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3514923.

The product of its digits is 81648, while the sum is 42.

The square root of 643219197 is about 25361.7664408456. The cubic root of 643219197 is about 863.2163663218.

The spelling of 643219197 in words is "six hundred forty-three million, two hundred nineteen thousand, one hundred ninety-seven".