639311 has 2 divisors, whose sum is σ = 639312. Its totient is φ = 639310.

The previous prime is 639307. The next prime is 639329. The reversal of 639311 is 113936.

639311 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 639311 - 2² = 639307 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 639311.

It is not a weakly prime, because it can be changed into another prime (639361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319655 + 319656.

It is an arithmetic number, because the mean of its divisors is an integer number (319656).

2⁶³⁹³¹¹ is an apocalyptic number.

639311 is a deficient number, since it is larger than the sum of its proper divisors (1).

639311 is an equidigital number, since it uses as much as digits as its factorization.

639311 is an evil number, because the sum of its binary digits is even.

The product of its digits is 486, while the sum is 23.

The square root of 639311 is about 799.5692590389. The cubic root of 639311 is about 86.1464513824.

The spelling of 639311 in words is "six hundred thirty-nine thousand, three hundred eleven".