639514541 has 2 divisors, whose sum is σ = 639514542. Its totient is φ = 639514540.

The previous prime is 639514523. The next prime is 639514591. The reversal of 639514541 is 145415936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 636805225 + 2709316 = 25235^2 + 1646^2 .

It is a cyclic number.

It is not a de Polignac number, because 639514541 - 2¹⁴ = 639498157 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 639514495 and 639514504.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639514591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319757270 + 319757271.

It is an arithmetic number, because the mean of its divisors is an integer number (319757271).

Almost surely, 2^639514541 is an apocalyptic number.

It is an amenable number.

639514541 is a deficient number, since it is larger than the sum of its proper divisors (1).

639514541 is an equidigital number, since it uses as much as digits as its factorization.

639514541 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 38.

The square root of 639514541 is about 25288.6247352441. The cubic root of 639514541 is about 861.5559272070. Note that the first 3 decimals are identical.

The spelling of 639514541 in words is "six hundred thirty-nine million, five hundred fourteen thousand, five hundred forty-one".