641823897 has 32 divisors (see below), whose sum is σ = 1009846656. Its totient is φ = 357465600.

The previous prime is 641823863. The next prime is 641823983. The reversal of 641823897 is 798328146.

It is not a de Polignac number, because 641823897 - 2¹⁰ = 641822873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (641823197) 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, 96747 + ... + 103167.

It is an arithmetic number, because the mean of its divisors is an integer number (31557708).

Almost surely, 2^641823897 is an apocalyptic number.

It is an amenable number.

641823897 is a deficient number, since it is larger than the sum of its proper divisors (368022759).

641823897 is a wasteful number, since it uses less digits than its factorization.

641823897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6681.

The product of its digits is 580608, while the sum is 48.

The square root of 641823897 is about 25334.2435647880. The cubic root of 641823897 is about 862.5917385302.

The spelling of 641823897 in words is "six hundred forty-one million, eight hundred twenty-three thousand, eight hundred ninety-seven".