51012980849 has 2 divisors, whose sum is σ = 51012980850. Its totient is φ = 51012980848.

The previous prime is 51012980839. The next prime is 51012980897. The reversal of 51012980849 is 94808921015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36809108449 + 14203872400 = 191857^2 + 119180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51012980849 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51012980839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25506490424 + 25506490425.

It is an arithmetic number, because the mean of its divisors is an integer number (25506490425).

Almost surely, 2^51012980849 is an apocalyptic number.

It is an amenable number.

51012980849 is a deficient number, since it is larger than the sum of its proper divisors (1).

51012980849 is an equidigital number, since it uses as much as digits as its factorization.

51012980849 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 47.

The spelling of 51012980849 in words is "fifty-one billion, twelve million, nine hundred eighty thousand, eight hundred forty-nine".