643619103 has 4 divisors (see below), whose sum is σ = 858158808. Its totient is φ = 429079400.

The previous prime is 643619089. The next prime is 643619131. The reversal of 643619103 is 301916346.

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 643619103 - 2⁵ = 643619071 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643619803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107269848 + ... + 107269853.

It is an arithmetic number, because the mean of its divisors is an integer number (214539702).

Almost surely, 2^643619103 is an apocalyptic number.

643619103 is a deficient number, since it is larger than the sum of its proper divisors (214539705).

643619103 is a wasteful number, since it uses less digits than its factorization.

643619103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214539704.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 643619103 is about 25369.6492486593. The cubic root of 643619103 is about 863.3952239023.

The spelling of 643619103 in words is "six hundred forty-three million, six hundred nineteen thousand, one hundred three".