643130135 has 4 divisors (see below), whose sum is σ = 771756168. Its totient is φ = 514504104.

The previous prime is 643130087. The next prime is 643130203. The reversal of 643130135 is 531031346.

643130135 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 643130135 - 2²² = 638935831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64313009 + ... + 64313018.

It is an arithmetic number, because the mean of its divisors is an integer number (192939042).

Almost surely, 2^643130135 is an apocalyptic number.

643130135 is a deficient number, since it is larger than the sum of its proper divisors (128626033).

643130135 is a wasteful number, since it uses less digits than its factorization.

643130135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128626032.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 643130135 is about 25360.0105481051. The cubic root of 643130135 is about 863.1765233336.

The spelling of 643130135 in words is "six hundred forty-three million, one hundred thirty thousand, one hundred thirty-five".