101639 has 8 divisors (see below), whose sum is σ = 108528. Its totient is φ = 95040.

The previous prime is 101627. The next prime is 101641. The reversal of 101639 is 936101.

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

It is a cyclic number.

It is not a de Polignac number, because 101639 - 2⁸ = 101383 is a prime.

It is a Duffinian number.

It is the 41-st Perrin number.

It is a self number, because there is not a number n which added to its sum of digits gives 101639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101839) 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, 1484 + ... + 1550.

It is an arithmetic number, because the mean of its divisors is an integer number (13566).

2¹⁰¹⁶³⁹ is an apocalyptic number.

101639 is a deficient number, since it is larger than the sum of its proper divisors (6889).

101639 is an equidigital number, since it uses as much as digits as its factorization.

101639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145.

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

The square root of 101639 is about 318.8087200815. The cubic root of 101639 is about 46.6681008630.

The spelling of 101639 in words is "one hundred one thousand, six hundred thirty-nine".