643453 has 2 divisors, whose sum is σ = 643454. Its totient is φ = 643452.

The previous prime is 643439. The next prime is 643457. The reversal of 643453 is 354346.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438244 + 205209 = 662^2 + 453^2 .

It is a cyclic number.

It is not a de Polignac number, because 643453 - 2⁵ = 643421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (643457) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321726 + 321727.

It is an arithmetic number, because the mean of its divisors is an integer number (321727).

2⁶⁴³⁴⁵³ is an apocalyptic number.

It is an amenable number.

643453 is a deficient number, since it is larger than the sum of its proper divisors (1).

643453 is an equidigital number, since it uses as much as digits as its factorization.

643453 is an evil number, because the sum of its binary digits is even.

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

The square root of 643453 is about 802.1552218866. The cubic root of 643453 is about 86.3320943491.

Adding to 643453 its reverse (354346), we get a palindrome (997799).

The spelling of 643453 in words is "six hundred forty-three thousand, four hundred fifty-three".