51306205 has 8 divisors (see below), whose sum is σ = 61606872. Its totient is φ = 41018688.

The previous prime is 51306197. The next prime is 51306239. The reversal of 51306205 is 50260315.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 10614564 + 40691641 = 3258^2 + 6379^2 .

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 51306205 - 2³ = 51306197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10779 + ... + 14791.

It is an arithmetic number, because the mean of its divisors is an integer number (7700859).

Almost surely, 2^51306205 is an apocalyptic number.

It is an amenable number.

51306205 is a deficient number, since it is larger than the sum of its proper divisors (10300667).

51306205 is a wasteful number, since it uses less digits than its factorization.

51306205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6575.

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 51306205 is about 7162.8349834406. The cubic root of 51306205 is about 371.5836793363.

The spelling of 51306205 in words is "fifty-one million, three hundred six thousand, two hundred five".