51313216393 has 2 divisors, whose sum is σ = 51313216394. Its totient is φ = 51313216392.

The previous prime is 51313216387. The next prime is 51313216433. The reversal of 51313216393 is 39361231315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41859932409 + 9453283984 = 204597^2 + 97228^2 .

It is a cyclic number.

It is not a de Polignac number, because 51313216393 - 2⁹ = 51313215881 is a prime.

It is not a weakly prime, because it can be changed into another prime (51313216363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25656608196 + 25656608197.

It is an arithmetic number, because the mean of its divisors is an integer number (25656608197).

Almost surely, 2^51313216393 is an apocalyptic number.

It is an amenable number.

51313216393 is a deficient number, since it is larger than the sum of its proper divisors (1).

51313216393 is an equidigital number, since it uses as much as digits as its factorization.

51313216393 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 37.

The spelling of 51313216393 in words is "fifty-one billion, three hundred thirteen million, two hundred sixteen thousand, three hundred ninety-three".