640141343 has 2 divisors, whose sum is σ = 640141344. Its totient is φ = 640141342.

The previous prime is 640141321. The next prime is 640141349. The reversal of 640141343 is 343141046.

640141343 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 is a cyclic number.

It is not a de Polignac number, because 640141343 - 2⁶ = 640141279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640141349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320070671 + 320070672.

It is an arithmetic number, because the mean of its divisors is an integer number (320070672).

Almost surely, 2^640141343 is an apocalyptic number.

640141343 is a deficient number, since it is larger than the sum of its proper divisors (1).

640141343 is an equidigital number, since it uses as much as digits as its factorization.

640141343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 26.

The square root of 640141343 is about 25301.0146634478. The cubic root of 640141343 is about 861.8373118144.

Adding to 640141343 its reverse (343141046), we get a palindrome (983282389).

The spelling of 640141343 in words is "six hundred forty million, one hundred forty-one thousand, three hundred forty-three".