643043141 has 6 divisors (see below), whose sum is σ = 696313170. Its totient is φ = 593578128.

The previous prime is 643043101. The next prime is 643043147. The reversal of 643043141 is 141340346.

It can be written as a sum of positive squares in 3 ways, for example, as 39112516 + 603930625 = 6254^2 + 24575^2 .

It is not a de Polignac number, because 643043141 - 2⁶ = 643043077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 643043141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643043147) 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 5 ways as a sum of consecutive naturals, for example, 1902326 + ... + 1902663.

It is an arithmetic number, because the mean of its divisors is an integer number (116052195).

Almost surely, 2^643043141 is an apocalyptic number.

It is an amenable number.

643043141 is a deficient number, since it is larger than the sum of its proper divisors (53270029).

643043141 is a wasteful number, since it uses less digits than its factorization.

643043141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3805015 (or 3805002 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 643043141 is about 25358.2953094249. The cubic root of 643043141 is about 863.1376019394.

Adding to 643043141 its reverse (141340346), we get a palindrome (784383487).

The spelling of 643043141 in words is "six hundred forty-three million, forty-three thousand, one hundred forty-one".