1243331313 has 32 divisors (see below), whose sum is σ = 1950366720. Its totient is φ = 689653440.

The previous prime is 1243331303. The next prime is 1243331317. The reversal of 1243331313 is 3131333421.

It is a happy number.

It is not a de Polignac number, because 1243331313 - 2¹⁷ = 1243200241 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1243331317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 379878 + ... + 383136.

It is an arithmetic number, because the mean of its divisors is an integer number (60948960).

Almost surely, 2^1243331313 is an apocalyptic number.

It is an amenable number.

1243331313 is a deficient number, since it is larger than the sum of its proper divisors (707035407).

1243331313 is a wasteful number, since it uses less digits than its factorization.

1243331313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3797.

The product of its digits is 1944, while the sum is 24.

The square root of 1243331313 is about 35260.9034626171. The cubic root of 1243331313 is about 1075.2982948660.

Adding to 1243331313 its reverse (3131333421), we get a palindrome (4374664734).

The spelling of 1243331313 in words is "one billion, two hundred forty-three million, three hundred thirty-one thousand, three hundred thirteen".