639063193 has 2 divisors, whose sum is σ = 639063194. Its totient is φ = 639063192.

The previous prime is 639063181. The next prime is 639063199. The reversal of 639063193 is 391360936.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 630612544 + 8450649 = 25112^2 + 2907^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639063193 is a prime.

It is not a weakly prime, because it can be changed into another prime (639063199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319531596 + 319531597.

It is an arithmetic number, because the mean of its divisors is an integer number (319531597).

Almost surely, 2^639063193 is an apocalyptic number.

It is an amenable number.

639063193 is a deficient number, since it is larger than the sum of its proper divisors (1).

639063193 is an equidigital number, since it uses as much as digits as its factorization.

639063193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 40.

The square root of 639063193 is about 25279.6992268500. The cubic root of 639063193 is about 861.3531937076.

The spelling of 639063193 in words is "six hundred thirty-nine million, sixty-three thousand, one hundred ninety-three".