639058099 has 2 divisors, whose sum is σ = 639058100. Its totient is φ = 639058098.

The previous prime is 639058093. The next prime is 639058109. The reversal of 639058099 is 990850936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639058099 - 2¹⁹ = 638533811 is a prime.

It is not a weakly prime, because it can be changed into another prime (639058093) 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, 319529049 + 319529050.

It is an arithmetic number, because the mean of its divisors is an integer number (319529050).

Almost surely, 2^639058099 is an apocalyptic number.

639058099 is a deficient number, since it is larger than the sum of its proper divisors (1).

639058099 is an equidigital number, since it uses as much as digits as its factorization.

639058099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 49.

The square root of 639058099 is about 25279.5984738682. The cubic root of 639058099 is about 861.3509050738.

The spelling of 639058099 in words is "six hundred thirty-nine million, fifty-eight thousand, ninety-nine".