1223205215 has 4 divisors (see below), whose sum is σ = 1467846264. Its totient is φ = 978564168.

The previous prime is 1223205197. The next prime is 1223205227. The reversal of 1223205215 is 5125023221.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1223205215 is a prime.

It is a Duffinian 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, 122320517 + ... + 122320526.

It is an arithmetic number, because the mean of its divisors is an integer number (366961566).

Almost surely, 2^1223205215 is an apocalyptic number.

1223205215 is a deficient number, since it is larger than the sum of its proper divisors (244641049).

1223205215 is an equidigital number, since it uses as much as digits as its factorization.

1223205215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244641048.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 1223205215 is about 34974.3508159909. The cubic root of 1223205215 is about 1069.4646680148.

Adding to 1223205215 its reverse (5125023221), we get a palindrome (6348228436).

The spelling of 1223205215 in words is "one billion, two hundred twenty-three million, two hundred five thousand, two hundred fifteen".