51263460389 has 2 divisors, whose sum is σ = 51263460390. Its totient is φ = 51263460388.

The previous prime is 51263460379. The next prime is 51263460431. The reversal of 51263460389 is 98306436215.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43443064900 + 7820395489 = 208430^2 + 88433^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51263460389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51263460329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25631730194 + 25631730195.

It is an arithmetic number, because the mean of its divisors is an integer number (25631730195).

Almost surely, 2^51263460389 is an apocalyptic number.

It is an amenable number.

51263460389 is a deficient number, since it is larger than the sum of its proper divisors (1).

51263460389 is an equidigital number, since it uses as much as digits as its factorization.

51263460389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 51263460389 in words is "fifty-one billion, two hundred sixty-three million, four hundred sixty thousand, three hundred eighty-nine".