643181041 has 8 divisors (see below), whose sum is σ = 659602944. Its totient is φ = 626873280.

The previous prime is 643180991. The next prime is 643181047. The reversal of 643181041 is 140181346.

643181041 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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-643181041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643181047) 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, 17065 + ... + 39718.

It is an arithmetic number, because the mean of its divisors is an integer number (82450368).

Almost surely, 2^643181041 is an apocalyptic number.

It is an amenable number.

643181041 is a deficient number, since it is larger than the sum of its proper divisors (16421903).

643181041 is a wasteful number, since it uses less digits than its factorization.

643181041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57071.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 643181041 is about 25361.0141950199. The cubic root of 643181041 is about 863.1992972132.

The spelling of 643181041 in words is "six hundred forty-three million, one hundred eighty-one thousand, forty-one".