51165216 has 48 divisors (see below), whose sum is σ = 149234400. Its totient is φ = 17054784.

The previous prime is 51165203. The next prime is 51165217. The reversal of 51165216 is 61256115.

It is a happy number.

51165216 is a `hidden beast` number, since 5 + 1 + 1 + 652 + 1 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51165216.

It is not an unprimeable number, because it can be changed into a prime (51165217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28746 + ... + 30473.

It is an arithmetic number, because the mean of its divisors is an integer number (3109050).

Almost surely, 2^51165216 is an apocalyptic number.

It is an amenable number.

51165216 is an abundant number, since it is smaller than the sum of its proper divisors (98069184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51165216 is a wasteful number, since it uses less digits than its factorization.

51165216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59238 (or 59224 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 51165216 is about 7152.9865091443. The cubic root of 51165216 is about 371.2429975212.

The spelling of 51165216 in words is "fifty-one million, one hundred sixty-five thousand, two hundred sixteen".