639101 has 8 divisors (see below), whose sum is σ = 685824. Its totient is φ = 594000.

The previous prime is 639091. The next prime is 639137. The reversal of 639101 is 101936.

639101 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639101 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 476 + ... + 1226.

It is an arithmetic number, because the mean of its divisors is an integer number (85728).

2⁶³⁹¹⁰¹ is an apocalyptic number.

It is an amenable number.

639101 is a deficient number, since it is larger than the sum of its proper divisors (46723).

639101 is a wasteful number, since it uses less digits than its factorization.

639101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 162, while the sum is 20.

The square root of 639101 is about 799.4379275466. The cubic root of 639101 is about 86.1370179267.

The spelling of 639101 in words is "six hundred thirty-nine thousand, one hundred one".