1220403013 has 4 divisors (see below), whose sum is σ = 1220483628. Its totient is φ = 1220322400.

The previous prime is 1220403001. The next prime is 1220403017. The reversal of 1220403013 is 3103040221.

It is a happy number.

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: 3103040221 = 6367 ⋅487363.

It can be written as a sum of positive squares in 2 ways, for example, as 405700164 + 814702849 = 20142^2 + 28543^2 .

It is a cyclic number.

It is not a de Polignac number, because 1220403013 - 2⁹ = 1220402501 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 (1220403017) 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, 10006 + ... + 50407.

It is an arithmetic number, because the mean of its divisors is an integer number (305120907).

Almost surely, 2^1220403013 is an apocalyptic number.

It is an amenable number.

1220403013 is a deficient number, since it is larger than the sum of its proper divisors (80615).

1220403013 is an equidigital number, since it uses as much as digits as its factorization.

1220403013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80614.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 1220403013 is about 34934.2670310971. The cubic root of 1220403013 is about 1068.6473760403.

Adding to 1220403013 its reverse (3103040221), we get a palindrome (4323443234).

The spelling of 1220403013 in words is "one billion, two hundred twenty million, four hundred three thousand, thirteen".