645010441 has 4 divisors (see below), whose sum is σ = 650718612. Its totient is φ = 639302272.

The previous prime is 645010433. The next prime is 645010453. The reversal of 645010441 is 144010546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178623225 + 466387216 = 13365^2 + 21596^2 .

It is a cyclic number.

It is not a de Polignac number, because 645010441 - 2³ = 645010433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645010741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2853916 + ... + 2854141.

It is an arithmetic number, because the mean of its divisors is an integer number (162679653).

Almost surely, 2^645010441 is an apocalyptic number.

It is an amenable number.

645010441 is a deficient number, since it is larger than the sum of its proper divisors (5708171).

645010441 is a wasteful number, since it uses less digits than its factorization.

645010441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5708170.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 645010441 is about 25397.0557545555. The cubic root of 645010441 is about 864.0169218401.

Adding to 645010441 its reverse (144010546), we get a palindrome (789020987).

The spelling of 645010441 in words is "six hundred forty-five million, ten thousand, four hundred forty-one".