643450101 has 8 divisors (see below), whose sum is σ = 980495424. Its totient is φ = 367685760.

The previous prime is 643450097. The next prime is 643450103. The reversal of 643450101 is 101054346.

643450101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 643450101 - 2² = 643450097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643450103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15320220 + ... + 15320261.

It is an arithmetic number, because the mean of its divisors is an integer number (122561928).

Almost surely, 2^643450101 is an apocalyptic number.

It is an amenable number.

643450101 is a deficient number, since it is larger than the sum of its proper divisors (337045323).

643450101 is a wasteful number, since it uses less digits than its factorization.

643450101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30640491.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 643450101 is about 25366.3182389562. The cubic root of 643450101 is about 863.3196469592.

The spelling of 643450101 in words is "six hundred forty-three million, four hundred fifty thousand, one hundred one".