1221614165 has 8 divisors (see below), whose sum is σ = 1469869368. Its totient is φ = 974669760.

The previous prime is 1221614161. The next prime is 1221614167. The reversal of 1221614165 is 5614161221.

It can be written as a sum of positive squares in 4 ways, for example, as 118178641 + 1103435524 = 10871^2 + 33218^2 .

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

It is not a de Polignac number, because 1221614165 - 2² = 1221614161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221614161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325646 + ... + 329375.

It is an arithmetic number, because the mean of its divisors is an integer number (183733671).

Almost surely, 2^1221614165 is an apocalyptic number.

It is an amenable number.

1221614165 is a deficient number, since it is larger than the sum of its proper divisors (248255203).

1221614165 is an equidigital number, since it uses as much as digits as its factorization.

1221614165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655399.

The product of its digits is 2880, while the sum is 29.

The square root of 1221614165 is about 34951.5974599159. The cubic root of 1221614165 is about 1069.0007747313. Note that the first 3 decimals are identical.

Adding to 1221614165 its reverse (5614161221), we get a palindrome (6835775386).

The spelling of 1221614165 in words is "one billion, two hundred twenty-one million, six hundred fourteen thousand, one hundred sixty-five".