639067963 has 2 divisors, whose sum is σ = 639067964. Its totient is φ = 639067962.

The previous prime is 639067951. The next prime is 639067967. The reversal of 639067963 is 369760936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 639067963 - 2²¹ = 636970811 is a prime.

It is a super-2 number, since 2×639067963² = 816815722665938738, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (639067967) 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, 319533981 + 319533982.

It is an arithmetic number, because the mean of its divisors is an integer number (319533982).

Almost surely, 2^639067963 is an apocalyptic number.

639067963 is a deficient number, since it is larger than the sum of its proper divisors (1).

639067963 is an equidigital number, since it uses as much as digits as its factorization.

639067963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1102248, while the sum is 49.

The square root of 639067963 is about 25279.7935711509. The cubic root of 639067963 is about 861.3553367635.

The spelling of 639067963 in words is "six hundred thirty-nine million, sixty-seven thousand, nine hundred sixty-three".