639320611 has 2 divisors, whose sum is σ = 639320612. Its totient is φ = 639320610.

The previous prime is 639320593. The next prime is 639320621. The reversal of 639320611 is 116023936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639320611 - 2¹³ = 639312419 is a prime.

It is equal to p_33267028 and since 639320611 and 33267028 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (639320621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319660305 + 319660306.

It is an arithmetic number, because the mean of its divisors is an integer number (319660306).

Almost surely, 2^639320611 is an apocalyptic number.

639320611 is a deficient number, since it is larger than the sum of its proper divisors (1).

639320611 is an equidigital number, since it uses as much as digits as its factorization.

639320611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 639320611 is about 25284.7901118439. The cubic root of 639320611 is about 861.4688307080.

The spelling of 639320611 in words is "six hundred thirty-nine million, three hundred twenty thousand, six hundred eleven".