643260229 has 4 divisors (see below), whose sum is σ = 681099084. Its totient is φ = 605421376.

The previous prime is 643260221. The next prime is 643260239. The reversal of 643260229 is 922062346.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 264062500 + 379197729 = 16250^2 + 19473^2 .

It is a cyclic number.

It is not a de Polignac number, because 643260229 - 2³ = 643260221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 643260194 and 643260203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643260221) 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, 18919402 + ... + 18919435.

It is an arithmetic number, because the mean of its divisors is an integer number (170274771).

Almost surely, 2^643260229 is an apocalyptic number.

It is an amenable number.

643260229 is a deficient number, since it is larger than the sum of its proper divisors (37838855).

643260229 is a wasteful number, since it uses less digits than its factorization.

643260229 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37838854.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 643260229 is about 25362.5753621354. The cubic root of 643260229 is about 863.2347212574.

The spelling of 643260229 in words is "six hundred forty-three million, two hundred sixty thousand, two hundred twenty-nine".