51864147 has 12 divisors (see below), whose sum is σ = 77331904. Its totient is φ = 33460560.

The previous prime is 51864143. The next prime is 51864173. The reversal of 51864147 is 74146815.

It is a happy number.

51864147 is a `hidden beast` number, since 5 + 1 + 8 + 641 + 4 + 7 = 666.

51864147 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51864147 - 2² = 51864143 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51864143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92668 + ... + 93225.

Almost surely, 2^51864147 is an apocalyptic number.

51864147 is a deficient number, since it is larger than the sum of its proper divisors (25467757).

51864147 is a wasteful number, since it uses less digits than its factorization.

51864147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185930 (or 185927 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 51864147 is about 7201.6766797740. The cubic root of 51864147 is about 372.9257855113.

The spelling of 51864147 in words is "fifty-one million, eight hundred sixty-four thousand, one hundred forty-seven".