643211195 has 12 divisors (see below), whose sum is σ = 848401680. Its totient is φ = 467789520.

The previous prime is 643211159. The next prime is 643211197. The reversal of 643211195 is 591112346.

It is not a de Polignac number, because 643211195 - 2¹⁸ = 642949051 is a prime.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

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 11 ways as a sum of consecutive naturals, for example, 530975 + ... + 532184.

It is an arithmetic number, because the mean of its divisors is an integer number (70700140).

Almost surely, 2^643211195 is an apocalyptic number.

643211195 is a deficient number, since it is larger than the sum of its proper divisors (205190485).

643211195 is a wasteful number, since it uses less digits than its factorization.

643211195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063186 (or 1063175 counting only the distinct ones).

The product of its digits is 6480, while the sum is 32.

The square root of 643211195 is about 25361.6086832046. The cubic root of 643211195 is about 863.2127866785.

The spelling of 643211195 in words is "six hundred forty-three million, two hundred eleven thousand, one hundred ninety-five".