51459509 has 2 divisors, whose sum is σ = 51459510. Its totient is φ = 51459508.

The previous prime is 51459481. The next prime is 51459517. The reversal of 51459509 is 90595415.

51459509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37246609 + 14212900 = 6103^2 + 3770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51459509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51458509) 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, 25729754 + 25729755.

It is an arithmetic number, because the mean of its divisors is an integer number (25729755).

Almost surely, 2^51459509 is an apocalyptic number.

It is an amenable number.

51459509 is a deficient number, since it is larger than the sum of its proper divisors (1).

51459509 is an equidigital number, since it uses as much as digits as its factorization.

51459509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40500, while the sum is 38.

The square root of 51459509 is about 7173.5283508187. The cubic root of 51459509 is about 371.9534112272.

The spelling of 51459509 in words is "fifty-one million, four hundred fifty-nine thousand, five hundred nine".