123221165 has 4 divisors (see below), whose sum is σ = 147865404. Its totient is φ = 98576928.

The previous prime is 123221149. The next prime is 123221173. The reversal of 123221165 is 561122321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79370281 + 43850884 = 8909^2 + 6622^2 .

It is a cyclic number.

It is not a de Polignac number, because 123221165 - 2⁴ = 123221149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123221165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12322112 + ... + 12322121.

It is an arithmetic number, because the mean of its divisors is an integer number (36966351).

Almost surely, 2^123221165 is an apocalyptic number.

It is an amenable number.

123221165 is a deficient number, since it is larger than the sum of its proper divisors (24644239).

123221165 is an equidigital number, since it uses as much as digits as its factorization.

123221165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24644238.

The product of its digits is 720, while the sum is 23.

The square root of 123221165 is about 11100.5029165349. The cubic root of 123221165 is about 497.6168795194.

Adding to 123221165 its reverse (561122321), we get a palindrome (684343486).

The spelling of 123221165 in words is "one hundred twenty-three million, two hundred twenty-one thousand, one hundred sixty-five".