645543241 has 16 divisors (see below), whose sum is σ = 746444160. Its totient is φ = 546848640.

The previous prime is 645543209. The next prime is 645543247. The reversal of 645543241 is 142345546.

645543241 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 645543241 - 2⁵ = 645543209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 645543197 and 645543206.

It is not an unprimeable number, because it can be changed into a prime (645543247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 245365 + ... + 247981.

It is an arithmetic number, because the mean of its divisors is an integer number (46652760).

Almost surely, 2^645543241 is an apocalyptic number.

It is an amenable number.

645543241 is a deficient number, since it is larger than the sum of its proper divisors (100900919).

645543241 is a wasteful number, since it uses less digits than its factorization.

645543241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3024.

The product of its digits is 57600, while the sum is 34.

The square root of 645543241 is about 25407.5429941583. The cubic root of 645543241 is about 864.2547585688.

Adding to 645543241 its reverse (142345546), we get a palindrome (787888787).

The spelling of 645543241 in words is "six hundred forty-five million, five hundred forty-three thousand, two hundred forty-one".