101865 has 8 divisors (see below), whose sum is σ = 163008. Its totient is φ = 54320.

The previous prime is 101863. The next prime is 101869. The reversal of 101865 is 568101.

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

It is not a de Polignac number, because 101865 - 2¹ = 101863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (101863) 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, 3381 + ... + 3410.

It is an arithmetic number, because the mean of its divisors is an integer number (20376).

2¹⁰¹⁸⁶⁵ is an apocalyptic number.

101865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

101865 is a deficient number, since it is larger than the sum of its proper divisors (61143).

101865 is an equidigital number, since it uses as much as digits as its factorization.

101865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6799.

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 101865 is about 319.1629677767. The cubic root of 101865 is about 46.7026649678.

Adding to 101865 its reverse (568101), we get a palindrome (669966).

The spelling of 101865 in words is "one hundred one thousand, eight hundred sixty-five".