51012120251 has 2 divisors, whose sum is σ = 51012120252. Its totient is φ = 51012120250.

The previous prime is 51012120223. The next prime is 51012120307. The reversal of 51012120251 is 15202121015.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51012120251 - 2¹⁰ = 51012119227 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (51012120751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25506060125 + 25506060126.

It is an arithmetic number, because the mean of its divisors is an integer number (25506060126).

Almost surely, 2^51012120251 is an apocalyptic number.

51012120251 is a deficient number, since it is larger than the sum of its proper divisors (1).

51012120251 is an equidigital number, since it uses as much as digits as its factorization.

51012120251 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 200, while the sum is 20.

Adding to 51012120251 its reverse (15202121015), we get a palindrome (66214241266).

The spelling of 51012120251 in words is "fifty-one billion, twelve million, one hundred twenty thousand, two hundred fifty-one".