51116520 has 256 divisors, whose sum is σ = 196116480. Its totient is φ = 10368000.

The previous prime is 51116509. The next prime is 51116561. The reversal of 51116520 is 2561115.

It is a super-2 number, since 2×51116520² = 5225797233820800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 338445 + ... + 338595.

It is an arithmetic number, because the mean of its divisors is an integer number (766080).

Almost surely, 2^51116520 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 51116520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98058240).

51116520 is an abundant number, since it is smaller than the sum of its proper divisors (144999960).

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

51116520 is a wasteful number, since it uses less digits than its factorization.

51116520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 212 counting only the distinct ones).

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

The square root of 51116520 is about 7149.5818059520. The cubic root of 51116520 is about 371.1251844921.

Adding to 51116520 its reverse (2561115), we get a palindrome (53677635).

The spelling of 51116520 in words is "fifty-one million, one hundred sixteen thousand, five hundred twenty".