643422101 has 8 divisors (see below), whose sum is σ = 760696320. Its totient is φ = 532487088.

The previous prime is 643422097. The next prime is 643422107. The reversal of 643422101 is 101224346.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 643422101 - 2² = 643422097 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643422107) 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 7 ways as a sum of consecutive naturals, for example, 1584581 + ... + 1584986.

It is an arithmetic number, because the mean of its divisors is an integer number (95087040).

Almost surely, 2^643422101 is an apocalyptic number.

It is an amenable number.

643422101 is a deficient number, since it is larger than the sum of its proper divisors (117274219).

643422101 is a wasteful number, since it uses less digits than its factorization.

643422101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3169603.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 643422101 is about 25365.7663199833. The cubic root of 643422101 is about 863.3071242058.

Adding to 643422101 its reverse (101224346), we get a palindrome (744646447).

The spelling of 643422101 in words is "six hundred forty-three million, four hundred twenty-two thousand, one hundred one".