645315 has 16 divisors (see below), whose sum is σ = 1126656. Its totient is φ = 312800.

The previous prime is 645313. The next prime is 645329. The reversal of 645315 is 513546.

645315 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645315 - 2¹ = 645313 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645313) 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, 1791 + ... + 2120.

It is an arithmetic number, because the mean of its divisors is an integer number (70416).

2⁶⁴⁵³¹⁵ is an apocalyptic number.

645315 is a deficient number, since it is larger than the sum of its proper divisors (481341).

645315 is a wasteful number, since it uses less digits than its factorization.

645315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930.

The product of its digits is 1800, while the sum is 24.

The square root of 645315 is about 803.3150067066. The cubic root of 645315 is about 86.4152890039.

Subtracting from 645315 its reverse (513546), we obtain a square (131769 = 363²).

The spelling of 645315 in words is "six hundred forty-five thousand, three hundred fifteen".