1221065 has 8 divisors (see below), whose sum is σ = 1480128. Its totient is φ = 966960.

The previous prime is 1221061. The next prime is 1221079. The reversal of 1221065 is 5601221.

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

It is not a de Polignac number, because 1221065 - 2² = 1221061 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221061) 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, 671 + ... + 1700.

It is an arithmetic number, because the mean of its divisors is an integer number (185016).

2^1221065 is an apocalyptic number.

It is an amenable number.

1221065 is a deficient number, since it is larger than the sum of its proper divisors (259063).

1221065 is a wasteful number, since it uses less digits than its factorization.

1221065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2479.

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

The square root of 1221065 is about 1105.0180993993. The cubic root of 1221065 is about 106.8840564353.

Adding to 1221065 its reverse (5601221), we get a palindrome (6822286).

The spelling of 1221065 in words is "one million, two hundred twenty-one thousand, sixty-five".