51305117 has 4 divisors (see below), whose sum is σ = 51376416. Its totient is φ = 51233820.

The previous prime is 51305077. The next prime is 51305123. The reversal of 51305117 is 71150315.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51305117 - 2¹⁸ = 51042973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51305092 and 51305101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51305197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34559 + ... + 36012.

It is an arithmetic number, because the mean of its divisors is an integer number (12844104).

Almost surely, 2^51305117 is an apocalyptic number.

It is an amenable number.

51305117 is a deficient number, since it is larger than the sum of its proper divisors (71299).

51305117 is an equidigital number, since it uses as much as digits as its factorization.

51305117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71298.

The product of its (nonzero) digits is 525, while the sum is 23.

The square root of 51305117 is about 7162.7590354555. The cubic root of 51305117 is about 371.5810527150.

The spelling of 51305117 in words is "fifty-one million, three hundred five thousand, one hundred seventeen".