51244567513 has 2 divisors, whose sum is σ = 51244567514. Its totient is φ = 51244567512.

The previous prime is 51244567511. The next prime is 51244567531. The reversal of 51244567513 is 31576544215.

Together with next prime (51244567531) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51240207769 + 4359744 = 226363^2 + 2088^2 .

It is a cyclic number.

It is not a de Polignac number, because 51244567513 - 2¹ = 51244567511 is a prime.

Together with 51244567511, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 51244567513.

It is not a weakly prime, because it can be changed into another prime (51244567511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25622283756 + 25622283757.

It is an arithmetic number, because the mean of its divisors is an integer number (25622283757).

Almost surely, 2^51244567513 is an apocalyptic number.

It is an amenable number.

51244567513 is a deficient number, since it is larger than the sum of its proper divisors (1).

51244567513 is an equidigital number, since it uses as much as digits as its factorization.

51244567513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 504000, while the sum is 43.

The spelling of 51244567513 in words is "fifty-one billion, two hundred forty-four million, five hundred sixty-seven thousand, five hundred thirteen".