645301 has 6 divisors (see below), whose sum is σ = 662550. Its totient is φ = 628488.

The previous prime is 645257. The next prime is 645313. The reversal of 645301 is 103546.

It can be written as a sum of positive squares in only one way, i.e., 599076 + 46225 = 774^2 + 215^2 .

It is not a de Polignac number, because 645301 - 2⁹ = 644789 is a prime.

It is a Duffinian number.

645301 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645901) 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 5 ways as a sum of consecutive naturals, for example, 1675 + ... + 2023.

It is an arithmetic number, because the mean of its divisors is an integer number (110425).

2⁶⁴⁵³⁰¹ is an apocalyptic number.

It is an amenable number.

645301 is a deficient number, since it is larger than the sum of its proper divisors (17249).

645301 is an equidigital number, since it uses as much as digits as its factorization.

645301 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 435 (or 392 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 645301 is about 803.3062927676. The cubic root of 645301 is about 86.4146640777.

Adding to 645301 its reverse (103546), we get a palindrome (748847).

It can be divided in two parts, 645 and 301, that added together give a triangular number (946 = T₄₃).

The spelling of 645301 in words is "six hundred forty-five thousand, three hundred one".