1220165 has 4 divisors (see below), whose sum is σ = 1464204. Its totient is φ = 976128.

The previous prime is 1220147. The next prime is 1220171. The reversal of 1220165 is 5610221.

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 206116 + 1014049 = 454^2 + 1007^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220165 - 2⁸ = 1219909 is a prime.

It is a Duffinian number.

It is a Curzon number.

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, 122012 + ... + 122021.

It is an arithmetic number, because the mean of its divisors is an integer number (366051).

2^1220165 is an apocalyptic number.

It is an amenable number.

1220165 is a deficient number, since it is larger than the sum of its proper divisors (244039).

1220165 is an equidigital number, since it uses as much as digits as its factorization.

1220165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244038.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 1220165 is about 1104.6107911839. The cubic root of 1220165 is about 106.8577899400.

Adding to 1220165 its reverse (5610221), we get a palindrome (6830386).

The spelling of 1220165 in words is "one million, two hundred twenty thousand, one hundred sixty-five".