643374211 has 4 divisors (see below), whose sum is σ = 657063072. Its totient is φ = 629685352.

The previous prime is 643374209. The next prime is 643374227. The reversal of 643374211 is 112473346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 112473346 = 2 ⋅56236673.

It is a cyclic number.

It is not a de Polignac number, because 643374211 - 2¹ = 643374209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643374811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6844360 + ... + 6844453.

It is an arithmetic number, because the mean of its divisors is an integer number (164265768).

Almost surely, 2^643374211 is an apocalyptic number.

643374211 is a deficient number, since it is larger than the sum of its proper divisors (13688861).

643374211 is a wasteful number, since it uses less digits than its factorization.

643374211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13688860.

The product of its digits is 12096, while the sum is 31.

The square root of 643374211 is about 25364.8223135901. The cubic root of 643374211 is about 863.2857049830.

The spelling of 643374211 in words is "six hundred forty-three million, three hundred seventy-four thousand, two hundred eleven".