51684505 has 16 divisors (see below), whose sum is σ = 66263184. Its totient is φ = 38563840.

The previous prime is 51684461. The next prime is 51684527. The reversal of 51684505 is 50548615.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 5702544 + 45981961 = 2388^2 + 6781^2 .

It is not a de Polignac number, because 51684505 - 2⁹ = 51683993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 6915 + ... + 12295.

It is an arithmetic number, because the mean of its divisors is an integer number (4141449).

Almost surely, 2^51684505 is an apocalyptic number.

It is an amenable number.

51684505 is a deficient number, since it is larger than the sum of its proper divisors (14578679).

51684505 is a wasteful number, since it uses less digits than its factorization.

51684505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516.

The product of its (nonzero) digits is 24000, while the sum is 34.

The square root of 51684505 is about 7189.1936265481. The cubic root of 51684505 is about 372.4947193822.

The spelling of 51684505 in words is "fifty-one million, six hundred eighty-four thousand, five hundred five".