51015120 has 160 divisors (see below), whose sum is σ = 173238912. Its totient is φ = 12343296.

The previous prime is 51015103. The next prime is 51015131. The reversal of 51015120 is 2151015.

It is a super-2 number, since 2×51015120² = 5205084937228800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 51015120.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 258862 + ... + 259058.

Almost surely, 2^51015120 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 51015120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86619456).

51015120 is an abundant number, since it is smaller than the sum of its proper divisors (122223792).

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

51015120 is a wasteful number, since it uses less digits than its factorization.

51015120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 15.

The square root of 51015120 is about 7142.4869618362. The cubic root of 51015120 is about 370.8796213174.

Adding to 51015120 its reverse (2151015), we get a palindrome (53166135).

The spelling of 51015120 in words is "fifty-one million, fifteen thousand, one hundred twenty".