1220002013 has 4 divisors (see below), whose sum is σ = 1240002108. Its totient is φ = 1200001920.

The previous prime is 1220001973. The next prime is 1220002019. The reversal of 1220002013 is 3102000221.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 208889209 + 1011112804 = 14453^2 + 31798^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1220002013 is a prime.

It is a Duffinian number.

1220002013 is a modest number, since divided by 2013 gives 1220 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 1220001985 and 1220002003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1220002019) 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, 9999956 + ... + 10000077.

It is an arithmetic number, because the mean of its divisors is an integer number (310000527).

Almost surely, 2^1220002013 is an apocalyptic number.

It is an amenable number.

1220002013 is a deficient number, since it is larger than the sum of its proper divisors (20000095).

1220002013 is an equidigital number, since it uses as much as digits as its factorization.

1220002013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20000094.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1220002013 is about 34928.5272091452. The cubic root of 1220002013 is about 1068.5303178399.

Adding to 1220002013 its reverse (3102000221), we get a palindrome (4322002234).

The spelling of 1220002013 in words is "one billion, two hundred twenty million, two thousand, thirteen".