639141647 has 2 divisors, whose sum is σ = 639141648. Its totient is φ = 639141646.

The previous prime is 639141623. The next prime is 639141683. The reversal of 639141647 is 746141936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639141647 - 2¹⁶ = 639076111 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639141947) 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, 319570823 + 319570824.

It is an arithmetic number, because the mean of its divisors is an integer number (319570824).

Almost surely, 2^639141647 is an apocalyptic number.

639141647 is a deficient number, since it is larger than the sum of its proper divisors (1).

639141647 is an equidigital number, since it uses as much as digits as its factorization.

639141647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 639141647 is about 25281.2508986403. The cubic root of 639141647 is about 861.3884400072.

The spelling of 639141647 in words is "six hundred thirty-nine million, one hundred forty-one thousand, six hundred forty-seven".