646810241 has 24 divisors (see below), whose sum is σ = 824411520. Its totient is φ = 501799200.

The previous prime is 646810211. The next prime is 646810247. The reversal of 646810241 is 142018646.

It is not a de Polignac number, because 646810241 - 2¹⁴ = 646793857 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646810198 and 646810207.

It is not an unprimeable number, because it can be changed into a prime (646810247) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126311 + ... + 131331.

It is an arithmetic number, because the mean of its divisors is an integer number (34350480).

Almost surely, 2^646810241 is an apocalyptic number.

It is an amenable number.

646810241 is a deficient number, since it is larger than the sum of its proper divisors (177601279).

646810241 is a wasteful number, since it uses less digits than its factorization.

646810241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5285 (or 5278 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 646810241 is about 25432.4643123705. The cubic root of 646810241 is about 864.8198098835.

Adding to 646810241 its reverse (142018646), we get a palindrome (788828887).

The spelling of 646810241 in words is "six hundred forty-six million, eight hundred ten thousand, two hundred forty-one".