639455093 has 2 divisors, whose sum is σ = 639455094. Its totient is φ = 639455092.

The previous prime is 639455087. The next prime is 639455111. The reversal of 639455093 is 390554936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513611569 + 125843524 = 22663^2 + 11218^2 .

It is a cyclic number.

It is not a de Polignac number, because 639455093 - 2¹² = 639450997 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 (639455023) 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, 319727546 + 319727547.

It is an arithmetic number, because the mean of its divisors is an integer number (319727547).

Almost surely, 2^639455093 is an apocalyptic number.

It is an amenable number.

639455093 is a deficient number, since it is larger than the sum of its proper divisors (1).

639455093 is an equidigital number, since it uses as much as digits as its factorization.

639455093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437400, while the sum is 44.

The square root of 639455093 is about 25287.4493177940. The cubic root of 639455093 is about 861.5292302045.

The spelling of 639455093 in words is "six hundred thirty-nine million, four hundred fifty-five thousand, ninety-three".