1220055013 has 4 divisors (see below), whose sum is σ = 1220150700. Its totient is φ = 1219959328.

The previous prime is 1220054989. The next prime is 1220055049. The reversal of 1220055013 is 3105500221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3105500221 = 479 ⋅6483299.

It can be written as a sum of positive squares in 2 ways, for example, as 702356004 + 517699009 = 26502^2 + 22753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220055013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220059013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25120 + ... + 55417.

It is an arithmetic number, because the mean of its divisors is an integer number (305037675).

Almost surely, 2^1220055013 is an apocalyptic number.

It is an amenable number.

1220055013 is a deficient number, since it is larger than the sum of its proper divisors (95687).

1220055013 is an equidigital number, since it uses as much as digits as its factorization.

1220055013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95686.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1220055013 is about 34929.2858930726. The cubic root of 1220055013 is about 1068.5457908436.

Adding to 1220055013 its reverse (3105500221), we get a palindrome (4325555234).

The spelling of 1220055013 in words is "one billion, two hundred twenty million, fifty-five thousand, thirteen".