640132289 has 2 divisors, whose sum is σ = 640132290. Its totient is φ = 640132288.

The previous prime is 640132279. The next prime is 640132291. The reversal of 640132289 is 982231046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548355889 + 91776400 = 23417^2 + 9580^2 .

It is a cyclic number.

It is not a de Polignac number, because 640132289 - 2⁸ = 640132033 is a prime.

Together with 640132291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (640132219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320066144 + 320066145.

It is an arithmetic number, because the mean of its divisors is an integer number (320066145).

Almost surely, 2^640132289 is an apocalyptic number.

It is an amenable number.

640132289 is a deficient number, since it is larger than the sum of its proper divisors (1).

640132289 is an equidigital number, since it uses as much as digits as its factorization.

640132289 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 640132289 is about 25300.8357371847. The cubic root of 640132289 is about 861.8332485910.

The spelling of 640132289 in words is "six hundred forty million, one hundred thirty-two thousand, two hundred eighty-nine".