640583 has 2 divisors, whose sum is σ = 640584. Its totient is φ = 640582.

The previous prime is 640579. The next prime is 640589. The reversal of 640583 is 385046.

640583 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 is a cyclic number.

It is not a de Polignac number, because 640583 - 2² = 640579 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320291 + 320292.

It is an arithmetic number, because the mean of its divisors is an integer number (320292).

2⁶⁴⁰⁵⁸³ is an apocalyptic number.

640583 is a deficient number, since it is larger than the sum of its proper divisors (1).

640583 is an equidigital number, since it uses as much as digits as its factorization.

640583 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 640583 is about 800.3642920571. The cubic root of 640583 is about 86.2035470643.

The spelling of 640583 in words is "six hundred forty thousand, five hundred eighty-three".