645329 has 2 divisors, whose sum is σ = 645330. Its totient is φ = 645328.

The previous prime is 645313. The next prime is 645347. The reversal of 645329 is 923546.

645329 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 640000 + 5329 = 800^2 + 73^2 .

It is a cyclic number.

It is not a de Polignac number, because 645329 - 2⁴ = 645313 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645329.

It is not a weakly prime, because it can be changed into another prime (645529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322664 + 322665.

It is an arithmetic number, because the mean of its divisors is an integer number (322665).

2⁶⁴⁵³²⁹ is an apocalyptic number.

It is an amenable number.

645329 is a deficient number, since it is larger than the sum of its proper divisors (1).

645329 is an equidigital number, since it uses as much as digits as its factorization.

645329 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 29.

The square root of 645329 is about 803.3237205511. The cubic root of 645329 is about 86.4159139211.

It can be divided in two parts, 64 and 5329, that multiplied together give a square (341056 = 584²).

The spelling of 645329 in words is "six hundred forty-five thousand, three hundred twenty-nine".