643211198 has 16 divisors (see below), whose sum is σ = 1129542624. Its totient is φ = 268938240.

The previous prime is 643211197. The next prime is 643211221. The reversal of 643211198 is 891112346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643211197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559715 + ... + 560862.

It is an arithmetic number, because the mean of its divisors is an integer number (70596414).

Almost surely, 2^643211198 is an apocalyptic number.

643211198 is a deficient number, since it is larger than the sum of its proper divisors (486331426).

643211198 is a wasteful number, since it uses less digits than its factorization.

643211198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120627.

The product of its digits is 10368, while the sum is 35.

The square root of 643211198 is about 25361.6087423491. The cubic root of 643211198 is about 863.2127880205.

The spelling of 643211198 in words is "six hundred forty-three million, two hundred eleven thousand, one hundred ninety-eight".