645314125 has 8 divisors (see below), whose sum is σ = 805352184. Its totient is φ = 516251200.

The previous prime is 645314123. The next prime is 645314141. The reversal of 645314125 is 521413546.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18412681 + 626901444 = 4291^2 + 25038^2 .

It is not a de Polignac number, because 645314125 - 2¹ = 645314123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645314123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2581132 + ... + 2581381.

It is an arithmetic number, because the mean of its divisors is an integer number (100669023).

Almost surely, 2^645314125 is an apocalyptic number.

It is an amenable number.

645314125 is a deficient number, since it is larger than the sum of its proper divisors (160038059).

645314125 is an equidigital number, since it uses as much as digits as its factorization.

645314125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5162528 (or 5162518 counting only the distinct ones).

The product of its digits is 14400, while the sum is 31.

The square root of 645314125 is about 25403.0337755159. The cubic root of 645314125 is about 864.1524994627.

The spelling of 645314125 in words is "six hundred forty-five million, three hundred fourteen thousand, one hundred twenty-five".