51305113 has 4 divisors (see below), whose sum is σ = 52273188. Its totient is φ = 50337040.

The previous prime is 51305077. The next prime is 51305123. The reversal of 51305113 is 31150315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30946969 + 20358144 = 5563^2 + 4512^2 .

It is a cyclic number.

It is not a de Polignac number, because 51305113 - 2⁹ = 51304601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51305123) 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, 483958 + ... + 484063.

It is an arithmetic number, because the mean of its divisors is an integer number (13068297).

Almost surely, 2^51305113 is an apocalyptic number.

51305113 is a gapful number since it is divisible by the number (53) formed by its first and last digit.

It is an amenable number.

51305113 is a deficient number, since it is larger than the sum of its proper divisors (968075).

51305113 is an equidigital number, since it uses as much as digits as its factorization.

51305113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968074.

The product of its (nonzero) digits is 225, while the sum is 19.

The square root of 51305113 is about 7162.7587562335. The cubic root of 51305113 is about 371.5810430583.

Adding to 51305113 its reverse (31150315), we get a palindrome (82455428).

The spelling of 51305113 in words is "fifty-one million, three hundred five thousand, one hundred thirteen".