51730109 has 2 divisors, whose sum is σ = 51730110. Its totient is φ = 51730108.

The previous prime is 51730073. The next prime is 51730111. The reversal of 51730109 is 90103715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41964484 + 9765625 = 6478^2 + 3125^2 .

It is a cyclic number.

It is not a de Polignac number, because 51730109 - 2¹² = 51726013 is a prime.

Together with 51730111, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51730139) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25865054 + 25865055.

It is an arithmetic number, because the mean of its divisors is an integer number (25865055).

Almost surely, 2^51730109 is an apocalyptic number.

It is an amenable number.

51730109 is a deficient number, since it is larger than the sum of its proper divisors (1).

51730109 is an equidigital number, since it uses as much as digits as its factorization.

51730109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 945, while the sum is 26.

The square root of 51730109 is about 7192.3646320247. The cubic root of 51730109 is about 372.6042445057.

The spelling of 51730109 in words is "fifty-one million, seven hundred thirty thousand, one hundred nine".