51806867 has 12 divisors (see below), whose sum is σ = 60393096. Its totient is φ = 44311680.

The previous prime is 51806849. The next prime is 51806869. The reversal of 51806867 is 76860815.

It is not a de Polignac number, because 51806867 - 2¹⁰ = 51805843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51806869) 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 11 ways as a sum of consecutive naturals, for example, 32192 + ... + 33762.

It is an arithmetic number, because the mean of its divisors is an integer number (5032758).

Almost surely, 2^51806867 is an apocalyptic number.

51806867 is a deficient number, since it is larger than the sum of its proper divisors (8586229).

51806867 is a wasteful number, since it uses less digits than its factorization.

51806867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258 (or 2251 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 51806867 is about 7197.6987294551. The cubic root of 51806867 is about 372.7884455633.

The spelling of 51806867 in words is "fifty-one million, eight hundred six thousand, eight hundred sixty-seven".