645833 has 2 divisors, whose sum is σ = 645834. Its totient is φ = 645832.

The previous prime is 645803. The next prime is 645839. The reversal of 645833 is 338546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 644809 + 1024 = 803^2 + 32^2 .

It is a cyclic number.

It is not a de Polignac number, because 645833 - 2⁸ = 645577 is a prime.

It is a d-powerful number, because it can be written as 6⁶ + 4⁸ + 8 + 5 + 3⁷ + 3¹² .

It is a junction number, because it is equal to n+sod(n) for n = 645796 and 645805.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 645833.

It is not a weakly prime, because it can be changed into another prime (645839) 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, 322916 + 322917.

It is an arithmetic number, because the mean of its divisors is an integer number (322917).

2⁶⁴⁵⁸³³ is an apocalyptic number.

It is an amenable number.

645833 is a deficient number, since it is larger than the sum of its proper divisors (1).

645833 is an equidigital number, since it uses as much as digits as its factorization.

645833 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 645833 is about 803.6373560257. The cubic root of 645833 is about 86.4384049229.

The spelling of 645833 in words is "six hundred forty-five thousand, eight hundred thirty-three".