51511100243 has 2 divisors, whose sum is σ = 51511100244. Its totient is φ = 51511100242.

The previous prime is 51511100233. The next prime is 51511100261. The reversal of 51511100243 is 34200111515.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51511100243 - 2⁴ = 51511100227 is a prime.

It is not a weakly prime, because it can be changed into another prime (51511100233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25755550121 + 25755550122.

It is an arithmetic number, because the mean of its divisors is an integer number (25755550122).

Almost surely, 2^51511100243 is an apocalyptic number.

51511100243 is a deficient number, since it is larger than the sum of its proper divisors (1).

51511100243 is an equidigital number, since it uses as much as digits as its factorization.

51511100243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 600, while the sum is 23.

Adding to 51511100243 its reverse (34200111515), we get a palindrome (85711211758).

The spelling of 51511100243 in words is "fifty-one billion, five hundred eleven million, one hundred thousand, two hundred forty-three".