1243320420313 has 2 divisors, whose sum is σ = 1243320420314. Its totient is φ = 1243320420312.

The previous prime is 1243320420301. The next prime is 1243320420367. The reversal of 1243320420313 is 3130240233421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 913375869849 + 329944550464 = 955707^2 + 574408^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243320420313 - 2⁵ = 1243320420281 is a prime.

It is not a weakly prime, because it can be changed into another prime (1243320420373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621660210156 + 621660210157.

It is an arithmetic number, because the mean of its divisors is an integer number (621660210157).

Almost surely, 2^{1243320420313} is an apocalyptic number.

It is an amenable number.

1243320420313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243320420313 is an equidigital number, since it uses as much as digits as its factorization.

1243320420313 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 1243320420313 its reverse (3130240233421), we get a palindrome (4373560653734).

The spelling of 1243320420313 in words is "one trillion, two hundred forty-three billion, three hundred twenty million, four hundred twenty thousand, three hundred thirteen".