251340212243 has 2 divisors, whose sum is σ = 251340212244. Its totient is φ = 251340212242.

The previous prime is 251340212197. The next prime is 251340212269. The reversal of 251340212243 is 342212043152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251340212243 is a prime.

It is not a weakly prime, because it can be changed into another prime (251340212293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125670106121 + 125670106122.

It is an arithmetic number, because the mean of its divisors is an integer number (125670106122).

Almost surely, 2^251340212243 is an apocalyptic number.

251340212243 is a deficient number, since it is larger than the sum of its proper divisors (1).

251340212243 is an equidigital number, since it uses as much as digits as its factorization.

251340212243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 251340212243 its reverse (342212043152), we get a palindrome (593552255395).

The spelling of 251340212243 in words is "two hundred fifty-one billion, three hundred forty million, two hundred twelve thousand, two hundred forty-three".