640711319 has 2 divisors, whose sum is σ = 640711320. Its totient is φ = 640711318.

The previous prime is 640711307. The next prime is 640711327. The reversal of 640711319 is 913117046.

640711319 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 640711319 - 2⁴ = 640711303 is a prime.

It is a super-2 number, since 2×640711319² = 821021988589439522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (640711339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320355659 + 320355660.

It is an arithmetic number, because the mean of its divisors is an integer number (320355660).

Almost surely, 2^640711319 is an apocalyptic number.

640711319 is a deficient number, since it is larger than the sum of its proper divisors (1).

640711319 is an equidigital number, since it uses as much as digits as its factorization.

640711319 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 640711319 is about 25312.2760533303. The cubic root of 640711319 is about 862.0930266221.

The spelling of 640711319 in words is "six hundred forty million, seven hundred eleven thousand, three hundred nineteen".