1220145505 has 16 divisors (see below), whose sum is σ = 1551934080. Its totient is φ = 917731072.

The previous prime is 1220145499. The next prime is 1220145517. The reversal of 1220145505 is 5055410221.

It is a cyclic number.

It is not a de Polignac number, because 1220145505 - 2³ = 1220145497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220145505.

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, 79572 + ... + 93658.

It is an arithmetic number, because the mean of its divisors is an integer number (96995880).

Almost surely, 2^1220145505 is an apocalyptic number.

It is an amenable number.

1220145505 is a deficient number, since it is larger than the sum of its proper divisors (331788575).

1220145505 is a wasteful number, since it uses less digits than its factorization.

1220145505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15128.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 1220145505 is about 34930.5812290606. The cubic root of 1220145505 is about 1068.5722083559.

Adding to 1220145505 its reverse (5055410221), we get a palindrome (6275555726).

The spelling of 1220145505 in words is "one billion, two hundred twenty million, one hundred forty-five thousand, five hundred five".