643209113 has 16 divisors (see below), whose sum is σ = 664848000. Its totient is φ = 622003200.

The previous prime is 643209101. The next prime is 643209131. The reversal of 643209113 is 311902346.

It is a cyclic number.

It is not a de Polignac number, because 643209113 - 2⁴ = 643209097 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (643209143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1432313 + ... + 1432761.

It is an arithmetic number, because the mean of its divisors is an integer number (41553000).

Almost surely, 2^643209113 is an apocalyptic number.

It is an amenable number.

643209113 is a deficient number, since it is larger than the sum of its proper divisors (21638887).

643209113 is a wasteful number, since it uses less digits than its factorization.

643209113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 643209113 is about 25361.5676368792. The cubic root of 643209113 is about 863.2118553042.

The spelling of 643209113 in words is "six hundred forty-three million, two hundred nine thousand, one hundred thirteen".