643052121 has 8 divisors (see below), whose sum is σ = 857681280. Its totient is φ = 428562192.

The previous prime is 643052089. The next prime is 643052129. The reversal of 643052121 is 121250346.

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

It is not a de Polignac number, because 643052121 - 2⁵ = 643052089 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643052091 and 643052100.

It is not an unprimeable number, because it can be changed into a prime (643052129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23505 + ... + 42878.

It is an arithmetic number, because the mean of its divisors is an integer number (107210160).

Almost surely, 2^643052121 is an apocalyptic number.

It is an amenable number.

643052121 is a deficient number, since it is larger than the sum of its proper divisors (214629159).

643052121 is a wasteful number, since it uses less digits than its factorization.

643052121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69615.

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

The square root of 643052121 is about 25358.4723711820. The cubic root of 643052121 is about 863.1416197827.

The spelling of 643052121 in words is "six hundred forty-three million, fifty-two thousand, one hundred twenty-one".