645233 has 2 divisors, whose sum is σ = 645234. Its totient is φ = 645232.

The previous prime is 645187. The next prime is 645257. The reversal of 645233 is 332546.

645233 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 628849 + 16384 = 793^2 + 128^2 .

It is a cyclic number.

It is not a de Polignac number, because 645233 - 2⁸ = 644977 is a prime.

It is a Sophie Germain prime.

It is a d-powerful number, because it can be written as 6⁵ + 4² + 2¹³ + 5⁷ + 3⁹ + 3¹² .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645199 and 645208.

It is not a weakly prime, because it can be changed into another prime (645433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322616 + 322617.

It is an arithmetic number, because the mean of its divisors is an integer number (322617).

2⁶⁴⁵²³³ is an apocalyptic number.

It is an amenable number.

645233 is a deficient number, since it is larger than the sum of its proper divisors (1).

645233 is an equidigital number, since it uses as much as digits as its factorization.

645233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2160, while the sum is 23.

The square root of 645233 is about 803.2639665764. The cubic root of 645233 is about 86.4116285932.

Adding to 645233 its reverse (332546), we get a palindrome (977779).

It can be divided in two parts, 645 and 233, that added together give a palindrome (878).

The spelling of 645233 in words is "six hundred forty-five thousand, two hundred thirty-three".