51347509 has 2 divisors, whose sum is σ = 51347510. Its totient is φ = 51347508.

The previous prime is 51347507. The next prime is 51347533. The reversal of 51347509 is 90574315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50367409 + 980100 = 7097^2 + 990^2 .

It is a cyclic number.

It is not a de Polignac number, because 51347509 - 2¹ = 51347507 is a prime.

Together with 51347507, 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 (51347507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25673754 + 25673755.

It is an arithmetic number, because the mean of its divisors is an integer number (25673755).

Almost surely, 2^51347509 is an apocalyptic number.

It is an amenable number.

51347509 is a deficient number, since it is larger than the sum of its proper divisors (1).

51347509 is an equidigital number, since it uses as much as digits as its factorization.

51347509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 51347509 is about 7165.7176193316. The cubic root of 51347509 is about 371.6833669246.

The spelling of 51347509 in words is "fifty-one million, three hundred forty-seven thousand, five hundred nine".