51866847 has 12 divisors (see below), whose sum is σ = 79326000. Its totient is φ = 32543808.

The previous prime is 51866831. The next prime is 51866869. The reversal of 51866847 is 74866815.

It is a happy number.

It is not a de Polignac number, because 51866847 - 2⁴ = 51866831 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51866047) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 169347 + ... + 169652.

It is an arithmetic number, because the mean of its divisors is an integer number (6610500).

Almost surely, 2^51866847 is an apocalyptic number.

51866847 is a deficient number, since it is larger than the sum of its proper divisors (27459153).

51866847 is a wasteful number, since it uses less digits than its factorization.

51866847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339022 (or 339019 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 51866847 is about 7201.8641336809. The cubic root of 51866847 is about 372.9322567906.

The spelling of 51866847 in words is "fifty-one million, eight hundred sixty-six thousand, eight hundred forty-seven".