51210144306691 has 2 divisors, whose sum is σ = 51210144306692. Its totient is φ = 51210144306690.

The previous prime is 51210144306637. The next prime is 51210144306697. The reversal of 51210144306691 is 19660344101215.

51210144306691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51210144306691 is a prime.

It is not a weakly prime, because it can be changed into another prime (51210144306697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605072153345 + 25605072153346.

It is an arithmetic number, because the mean of its divisors is an integer number (25605072153346).

Almost surely, 2^{51210144306691} is an apocalyptic number.

51210144306691 is a deficient number, since it is larger than the sum of its proper divisors (1).

51210144306691 is an equidigital number, since it uses as much as digits as its factorization.

51210144306691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 51210144306691 in words is "fifty-one trillion, two hundred ten billion, one hundred forty-four million, three hundred six thousand, six hundred ninety-one".