51261559 has 2 divisors, whose sum is σ = 51261560. Its totient is φ = 51261558.

The previous prime is 51261557. The next prime is 51261577. The reversal of 51261559 is 95516215.

51261559 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51261559 - 2¹ = 51261557 is a prime.

It is a super-2 number, since 2×51261559² = 5255494862220962, which contains 22 as substring.

Together with 51261557, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51261557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25630779 + 25630780.

It is an arithmetic number, because the mean of its divisors is an integer number (25630780).

Almost surely, 2^51261559 is an apocalyptic number.

51261559 is a deficient number, since it is larger than the sum of its proper divisors (1).

51261559 is an equidigital number, since it uses as much as digits as its factorization.

51261559 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13500, while the sum is 34.

The square root of 51261559 is about 7159.7178017014. The cubic root of 51261559 is about 371.4758656106.

The spelling of 51261559 in words is "fifty-one million, two hundred sixty-one thousand, five hundred fifty-nine".