51285065 has 8 divisors (see below), whose sum is σ = 66276168. Its totient is φ = 37872000.

The previous prime is 51285061. The next prime is 51285077. The reversal of 51285065 is 56058215.

It can be written as a sum of positive squares in 4 ways, for example, as 9048064 + 42237001 = 3008^2 + 6499^2 .

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

It is not a de Polignac number, because 51285065 - 2² = 51285061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51285061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394436 + ... + 394565.

It is an arithmetic number, because the mean of its divisors is an integer number (8284521).

Almost surely, 2^51285065 is an apocalyptic number.

It is an amenable number.

51285065 is a deficient number, since it is larger than the sum of its proper divisors (14991103).

51285065 is a wasteful number, since it uses less digits than its factorization.

51285065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789019.

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 51285065 is about 7161.3591587072. The cubic root of 51285065 is about 371.5326370493.

The spelling of 51285065 in words is "fifty-one million, two hundred eighty-five thousand, sixty-five".