1243209343 has 2 divisors, whose sum is σ = 1243209344. Its totient is φ = 1243209342.

The previous prime is 1243209329. The next prime is 1243209391. The reversal of 1243209343 is 3439023421.

It is a weak prime.

It is an emirp because it is prime and its reverse (3439023421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1243209343 - 2⁹ = 1243208831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1243239343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621604671 + 621604672.

It is an arithmetic number, because the mean of its divisors is an integer number (621604672).

Almost surely, 2^1243209343 is an apocalyptic number.

1243209343 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243209343 is an equidigital number, since it uses as much as digits as its factorization.

1243209343 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 1243209343 is about 35259.1738842532. The cubic root of 1243209343 is about 1075.2631316930.

The spelling of 1243209343 in words is "one billion, two hundred forty-three million, two hundred nine thousand, three hundred forty-three".