1243313389 has 2 divisors, whose sum is σ = 1243313390. Its totient is φ = 1243313388.

The previous prime is 1243313387. The next prime is 1243313417. The reversal of 1243313389 is 9833133421.

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., 664092900 + 579220489 = 25770^2 + 24067^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243313389 - 2¹ = 1243313387 is a prime.

Together with 1243313387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243313381) 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 as a sum of consecutive naturals, namely, 621656694 + 621656695.

It is an arithmetic number, because the mean of its divisors is an integer number (621656695).

Almost surely, 2^1243313389 is an apocalyptic number.

It is an amenable number.

1243313389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243313389 is an equidigital number, since it uses as much as digits as its factorization.

1243313389 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 37.

The square root of 1243313389 is about 35260.6492991834. The cubic root of 1243313389 is about 1075.2931276353.

The spelling of 1243313389 in words is "one billion, two hundred forty-three million, three hundred thirteen thousand, three hundred eighty-nine".