641845971 has 32 divisors (see below), whose sum is σ = 1026206720. Its totient is φ = 394142112.

The previous prime is 641845969. The next prime is 641846039. The reversal of 641845971 is 179548146.

It is not a de Polignac number, because 641845971 - 2¹ = 641845969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (641845471) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190326 + ... + 193668.

It is an arithmetic number, because the mean of its divisors is an integer number (32068960).

Almost surely, 2^641845971 is an apocalyptic number.

641845971 is a deficient number, since it is larger than the sum of its proper divisors (384360749).

641845971 is a wasteful number, since it uses less digits than its factorization.

641845971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3912 (or 3906 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 641845971 is about 25334.6792164416. The cubic root of 641845971 is about 862.6016273444.

The spelling of 641845971 in words is "six hundred forty-one million, eight hundred forty-five thousand, nine hundred seventy-one".