51021510061 has 2 divisors, whose sum is σ = 51021510062. Its totient is φ = 51021510060.

The previous prime is 51021510019. The next prime is 51021510077. The reversal of 51021510061 is 16001512015.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28361928100 + 22659581961 = 168410^2 + 150531^2 .

It is a cyclic number.

It is not a de Polignac number, because 51021510061 - 2⁷ = 51021509933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51021510011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510755030 + 25510755031.

It is an arithmetic number, because the mean of its divisors is an integer number (25510755031).

Almost surely, 2^51021510061 is an apocalyptic number.

It is an amenable number.

51021510061 is a deficient number, since it is larger than the sum of its proper divisors (1).

51021510061 is an equidigital number, since it uses as much as digits as its factorization.

51021510061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 300, while the sum is 22.

The spelling of 51021510061 in words is "fifty-one billion, twenty-one million, five hundred ten thousand, sixty-one".