639455361 has 16 divisors (see below), whose sum is σ = 897561216. Its totient is φ = 404155136.

The previous prime is 639455359. The next prime is 639455413. The reversal of 639455361 is 163554936.

It is a cyclic number.

It is not a de Polignac number, because 639455361 - 2¹ = 639455359 is a prime.

It is not an unprimeable number, because it can be changed into a prime (639455261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33210 + ... + 48803.

It is an arithmetic number, because the mean of its divisors is an integer number (56097576).

Almost surely, 2^639455361 is an apocalyptic number.

It is an amenable number.

639455361 is a deficient number, since it is larger than the sum of its proper divisors (258105855).

639455361 is a wasteful number, since it uses less digits than its factorization.

639455361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82152.

The product of its digits is 291600, while the sum is 42.

The square root of 639455361 is about 25287.4546168649. The cubic root of 639455361 is about 861.5293505620.

The spelling of 639455361 in words is "six hundred thirty-nine million, four hundred fifty-five thousand, three hundred sixty-one".