122665 has 4 divisors (see below), whose sum is σ = 147204. Its totient is φ = 98128.

The previous prime is 122663. The next prime is 122693. The reversal of 122665 is 566221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566221 = 137 ⋅4133.

It can be written as a sum of positive squares in 2 ways, for example, as 17689 + 104976 = 133^2 + 324^2 .

It is a cyclic number.

It is not a de Polignac number, because 122665 - 2¹ = 122663 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

122665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (122663) 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 3 ways as a sum of consecutive naturals, for example, 12262 + ... + 12271.

It is an arithmetic number, because the mean of its divisors is an integer number (36801).

2¹²²⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

122665 is a deficient number, since it is larger than the sum of its proper divisors (24539).

122665 is an equidigital number, since it uses as much as digits as its factorization.

122665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24538.

The product of its digits is 720, while the sum is 22.

The square root of 122665 is about 350.2356349659. The cubic root of 122665 is about 49.6867077257.

Adding to 122665 its reverse (566221), we get a palindrome (688886).

Subtracting 122665 from its reverse (566221), we obtain a square (443556 = 666²).

It can be divided in two parts, 122 and 665, that added together give a palindrome (787).

The spelling of 122665 in words is "one hundred twenty-two thousand, six hundred sixty-five".