51510216 has 128 divisors (see below), whose sum is σ = 144460800. Its totient is φ = 15240960.

The previous prime is 51510211. The next prime is 51510229. The reversal of 51510216 is 61201515.

It is a junction number, because it is equal to n+sod(n) for n = 51510192 and 51510201.

It is not an unprimeable number, because it can be changed into a prime (51510211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 725461 + ... + 725531.

It is an arithmetic number, because the mean of its divisors is an integer number (1128600).

Almost surely, 2^51510216 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 51510216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72230400).

51510216 is an abundant number, since it is smaller than the sum of its proper divisors (92950584).

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

51510216 is a wasteful number, since it uses less digits than its factorization.

51510216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 175 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 51510216 is about 7177.0617943557. The cubic root of 51510216 is about 372.0755425264.

It can be divided in two parts, 515 and 10216, that added together give a triangular number (10731 = T₁₄₆).

The spelling of 51510216 in words is "fifty-one million, five hundred ten thousand, two hundred sixteen".