641911871 has 8 divisors (see below), whose sum is σ = 644920224. Its totient is φ = 638910720.

The previous prime is 641911859. The next prime is 641911901. The reversal of 641911871 is 178119146.

641911871 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-641911871 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 (641911801) 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, 255206 + ... + 257708.

It is an arithmetic number, because the mean of its divisors is an integer number (80615028).

Almost surely, 2^641911871 is an apocalyptic number.

641911871 is a deficient number, since it is larger than the sum of its proper divisors (3008353).

641911871 is a wasteful number, since it uses less digits than its factorization.

641911871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601.

The product of its digits is 12096, while the sum is 38.

The square root of 641911871 is about 25335.9797718580. The cubic root of 641911871 is about 862.6311481871.

The spelling of 641911871 in words is "six hundred forty-one million, nine hundred eleven thousand, eight hundred seventy-one".