645433201 has 16 divisors (see below), whose sum is σ = 745176960. Its totient is φ = 547597440.

The previous prime is 645433189. The next prime is 645433207. The reversal of 645433201 is 102334546.

645433201 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 645433201 - 2¹⁵ = 645400433 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645433201.

It is not an unprimeable number, because it can be changed into a prime (645433207) 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, 521155 + ... + 522391.

It is an arithmetic number, because the mean of its divisors is an integer number (46573560).

Almost surely, 2^645433201 is an apocalyptic number.

It is an amenable number.

645433201 is a deficient number, since it is larger than the sum of its proper divisors (99743759).

645433201 is a wasteful number, since it uses less digits than its factorization.

645433201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1944.

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 645433201 is about 25405.3774032192. The cubic root of 645433201 is about 864.2056485108.

Adding to 645433201 its reverse (102334546), we get a palindrome (747767747).

It can be divided in two parts, 645 and 433201, that added together give a triangular number (433846 = T₉₃₁).

The spelling of 645433201 in words is "six hundred forty-five million, four hundred thirty-three thousand, two hundred one".