51286013 has 2 divisors, whose sum is σ = 51286014. Its totient is φ = 51286012.

The previous prime is 51286003. The next prime is 51286031. The reversal of 51286013 is 31068215.

Together with next prime (51286031) 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., 49042009 + 2244004 = 7003^2 + 1498^2 .

It is a cyclic number.

It is not a de Polignac number, because 51286013 - 2⁸ = 51285757 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51286003) 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, 25643006 + 25643007.

It is an arithmetic number, because the mean of its divisors is an integer number (25643007).

Almost surely, 2^51286013 is an apocalyptic number.

It is an amenable number.

51286013 is a deficient number, since it is larger than the sum of its proper divisors (1).

51286013 is an equidigital number, since it uses as much as digits as its factorization.

51286013 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 51286013 is about 7161.4253469543. The cubic root of 51286013 is about 371.5349262848.

The spelling of 51286013 in words is "fifty-one million, two hundred eighty-six thousand, thirteen".