51143616 has 112 divisors (see below), whose sum is σ = 159288480. Its totient is φ = 16035840.

The previous prime is 51143593. The next prime is 51143623. The reversal of 51143616 is 61634115.

51143616 is a `hidden beast` number, since 5 + 1 + 1 + 43 + 616 = 666.

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

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 51143616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28506 + ... + 30246.

Almost surely, 2^51143616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51143616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79644240).

51143616 is an abundant number, since it is smaller than the sum of its proper divisors (108144864).

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

51143616 is a wasteful number, since it uses less digits than its factorization.

51143616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1779 (or 1763 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 51143616 is about 7151.4764909073. The cubic root of 51143616 is about 371.1907486299.

The spelling of 51143616 in words is "fifty-one million, one hundred forty-three thousand, six hundred sixteen".