1242220313 has 6 divisors (see below), whose sum is σ = 1283585562. Its totient is φ = 1202147760.

The previous prime is 1242220297. The next prime is 1242220319. The reversal of 1242220313 is 3130222421.

It can be written as a sum of positive squares in only one way, i.e., 1199029129 + 43191184 = 34627^2 + 6572^2 .

It is not a de Polignac number, because 1242220313 - 2⁴ = 1242220297 is a prime.

It is a super-2 number, since 2×1242220313² = 3086222612059635938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1242220319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 645356 + ... + 647277.

It is an arithmetic number, because the mean of its divisors is an integer number (213930927).

Almost surely, 2^1242220313 is an apocalyptic number.

It is an amenable number.

1242220313 is a deficient number, since it is larger than the sum of its proper divisors (41365249).

1242220313 is an equidigital number, since it uses as much as digits as its factorization.

1242220313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1292695 (or 1292664 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1242220313 is about 35245.1459494779. The cubic root of 1242220313 is about 1074.9779156812.

Adding to 1242220313 its reverse (3130222421), we get a palindrome (4372442734).

The spelling of 1242220313 in words is "one billion, two hundred forty-two million, two hundred twenty thousand, three hundred thirteen".