1242320313305 has 4 divisors (see below), whose sum is σ = 1490784375972. Its totient is φ = 993856250640.

The previous prime is 1242320313263. The next prime is 1242320313359. The reversal of 1242320313305 is 5033130232421.

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 538446296521 + 703874016784 = 733789^2 + 838972^2 .

It is not a de Polignac number, because 1242320313305 - 2²⁰ = 1242319264729 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124232031326 + ... + 124232031335.

It is an arithmetic number, because the mean of its divisors is an integer number (372696093993).

Almost surely, 2^{1242320313305} is an apocalyptic number.

It is an amenable number.

1242320313305 is a deficient number, since it is larger than the sum of its proper divisors (248464062667).

1242320313305 is an equidigital number, since it uses as much as digits as its factorization.

1242320313305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248464062666.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 1242320313305 its reverse (5033130232421), we get a palindrome (6275450545726).

The spelling of 1242320313305 in words is "one trillion, two hundred forty-two billion, three hundred twenty million, three hundred thirteen thousand, three hundred five".