1243304431 has 2 divisors, whose sum is σ = 1243304432. Its totient is φ = 1243304430.

The previous prime is 1243304429. The next prime is 1243304437. The reversal of 1243304431 is 1344033421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1243304431 - 2¹ = 1243304429 is a prime.

It is a super-2 number, since 2×1243304431² = 3091611816288467522, which contains 22 as substring.

Together with 1243304429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1243304396 and 1243304405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243304437) 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, 621652215 + 621652216.

It is an arithmetic number, because the mean of its divisors is an integer number (621652216).

Almost surely, 2^1243304431 is an apocalyptic number.

1243304431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243304431 is an equidigital number, since it uses as much as digits as its factorization.

1243304431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1243304431 is about 35260.5222735001. The cubic root of 1243304431 is about 1075.2905451544.

Adding to 1243304431 its reverse (1344033421), we get a palindrome (2587337852).

The spelling of 1243304431 in words is "one billion, two hundred forty-three million, three hundred four thousand, four hundred thirty-one".