643281287141 has 4 divisors (see below), whose sum is σ = 643283593932. Its totient is φ = 643278980352.

The previous prime is 643281287113. The next prime is 643281287219. The reversal of 643281287141 is 141782182346.

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 40905062500 + 602376224641 = 202250^2 + 776129^2 .

It is a cyclic number.

It is not a de Polignac number, because 643281287141 - 2²² = 643277092837 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 (643281287111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666620 + ... + 1315653.

It is an arithmetic number, because the mean of its divisors is an integer number (160820898483).

Almost surely, 2^643281287141 is an apocalyptic number.

It is an amenable number.

643281287141 is a deficient number, since it is larger than the sum of its proper divisors (2306791).

643281287141 is a wasteful number, since it uses less digits than its factorization.

643281287141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2306790.

The product of its digits is 516096, while the sum is 47.

The spelling of 643281287141 in words is "six hundred forty-three billion, two hundred eighty-one million, two hundred eighty-seven thousand, one hundred forty-one".