51025206209 has 2 divisors, whose sum is σ = 51025206210. Its totient is φ = 51025206208.

The previous prime is 51025206181. The next prime is 51025206241. The reversal of 51025206209 is 90260252015.

It is an a-pointer prime, because the next prime (51025206241) can be obtained adding 51025206209 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33694273600 + 17330932609 = 183560^2 + 131647^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51025206209 is a prime.

It is not a weakly prime, because it can be changed into another prime (51025206269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25512603104 + 25512603105.

It is an arithmetic number, because the mean of its divisors is an integer number (25512603105).

Almost surely, 2^51025206209 is an apocalyptic number.

It is an amenable number.

51025206209 is a deficient number, since it is larger than the sum of its proper divisors (1).

51025206209 is an equidigital number, since it uses as much as digits as its factorization.

51025206209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 51025206209 in words is "fifty-one billion, twenty-five million, two hundred six thousand, two hundred nine".