3121120243 has 2 divisors, whose sum is σ = 3121120244. Its totient is φ = 3121120242.

The previous prime is 3121120241. The next prime is 3121120259. The reversal of 3121120243 is 3420211213.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3121120243 - 2¹ = 3121120241 is a prime.

Together with 3121120241, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 3121120243.

It is not a weakly prime, because it can be changed into another prime (3121120241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1560560121 + 1560560122.

It is an arithmetic number, because the mean of its divisors is an integer number (1560560122).

Almost surely, 2^3121120243 is an apocalyptic number.

3121120243 is a deficient number, since it is larger than the sum of its proper divisors (1).

3121120243 is an equidigital number, since it uses as much as digits as its factorization.

3121120243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 3121120243 is about 55866.9870585483. The cubic root of 3121120243 is about 1461.4035797018.

Adding to 3121120243 its reverse (3420211213), we get a palindrome (6541331456).

The spelling of 3121120243 in words is "three billion, one hundred twenty-one million, one hundred twenty thousand, two hundred forty-three".