641941971 has 32 divisors (see below), whose sum is σ = 962896896. Its totient is φ = 376992000.

The previous prime is 641941967. The next prime is 641942011. The reversal of 641941971 is 179149146.

It is not a de Polignac number, because 641941971 - 2² = 641941967 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641941171) 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 31 ways as a sum of consecutive naturals, for example, 342166 + ... + 344036.

It is an arithmetic number, because the mean of its divisors is an integer number (30090528).

Almost surely, 2^641941971 is an apocalyptic number.

641941971 is a deficient number, since it is larger than the sum of its proper divisors (320954925).

641941971 is a wasteful number, since it uses less digits than its factorization.

641941971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2203.

The product of its digits is 54432, while the sum is 42.

The square root of 641941971 is about 25336.5737817883. The cubic root of 641941971 is about 862.6446312382.

The spelling of 641941971 in words is "six hundred forty-one million, nine hundred forty-one thousand, nine hundred seventy-one".