51245305 has 8 divisors (see below), whose sum is σ = 61557192. Its totient is φ = 40954368.

The previous prime is 51245273. The next prime is 51245309. The reversal of 51245305 is 50354215.

It can be written as a sum of positive squares in 4 ways, for example, as 8904256 + 42341049 = 2984^2 + 6507^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51245305 - 2⁵ = 51245273 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51245305.

It is not an unprimeable number, because it can be changed into a prime (51245309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 777 + ... + 10153.

It is an arithmetic number, because the mean of its divisors is an integer number (7694649).

Almost surely, 2^51245305 is an apocalyptic number.

It is an amenable number.

51245305 is a deficient number, since it is larger than the sum of its proper divisors (10311887).

51245305 is a wasteful number, since it uses less digits than its factorization.

51245305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10475.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 51245305 is about 7158.5826111040. The cubic root of 51245305 is about 371.4365989741.

The spelling of 51245305 in words is "fifty-one million, two hundred forty-five thousand, three hundred five".