645433 has 2 divisors, whose sum is σ = 645434. Its totient is φ = 645432.

The previous prime is 645431. The next prime is 645443. The reversal of 645433 is 334546.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426409 + 219024 = 653^2 + 468^2 .

It is a cyclic number.

It is not a de Polignac number, because 645433 - 2¹ = 645431 is a prime.

Together with 645431, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 645398 and 645407.

It is not a weakly prime, because it can be changed into another prime (645431) 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 as a sum of consecutive naturals, namely, 322716 + 322717.

It is an arithmetic number, because the mean of its divisors is an integer number (322717).

2⁶⁴⁵⁴³³ is an apocalyptic number.

It is an amenable number.

645433 is a deficient number, since it is larger than the sum of its proper divisors (1).

645433 is an equidigital number, since it uses as much as digits as its factorization.

645433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4320, while the sum is 25.

The square root of 645433 is about 803.3884490083. The cubic root of 645433 is about 86.4205558801.

Adding to 645433 its reverse (334546), we get a palindrome (979979).

It can be divided in two parts, 64543 and 3, that added together give a palindrome (64546).

The spelling of 645433 in words is "six hundred forty-five thousand, four hundred thirty-three".