51111320 has 64 divisors (see below), whose sum is σ = 124679520. Its totient is φ = 18745344.

The previous prime is 51111301. The next prime is 51111329. The reversal of 51111320 is 2311115.

51111320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51111320² = 5224734064284800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51111295 and 51111304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51111329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117824 + ... + 118256.

Almost surely, 2^51111320 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 51111320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62339760).

51111320 is an abundant number, since it is smaller than the sum of its proper divisors (73568200).

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

51111320 is a wasteful number, since it uses less digits than its factorization.

51111320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 680 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 14.

The square root of 51111320 is about 7149.2181390695. The cubic root of 51111320 is about 371.1125994126.

Adding to 51111320 its reverse (2311115), we get a palindrome (53422435).

The spelling of 51111320 in words is "fifty-one million, one hundred eleven thousand, three hundred twenty".