1220530505 has 16 divisors (see below), whose sum is σ = 1478749440. Its totient is φ = 967051008.

The previous prime is 1220530499. The next prime is 1220530529. The reversal of 1220530505 is 5050350221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220530505 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319889 + ... + 323681.

It is an arithmetic number, because the mean of its divisors is an integer number (92421840).

Almost surely, 2^1220530505 is an apocalyptic number.

It is an amenable number.

1220530505 is a deficient number, since it is larger than the sum of its proper divisors (258218935).

1220530505 is a wasteful number, since it uses less digits than its factorization.

1220530505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4400.

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 1220530505 is about 34936.0917247479. The cubic root of 1220530505 is about 1068.6845875860.

Adding to 1220530505 its reverse (5050350221), we get a palindrome (6270880726).

The spelling of 1220530505 in words is "one billion, two hundred twenty million, five hundred thirty thousand, five hundred five".