51111560 has 64 divisors (see below), whose sum is σ = 121374720. Its totient is φ = 19342080.

The previous prime is 51111559. The next prime is 51111581. The reversal of 51111560 is 6511115.

It is a super-2 number, since 2×51111560² = 5224783131267200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 57842 + ... + 58718.

It is an arithmetic number, because the mean of its divisors is an integer number (1896480).

Almost surely, 2^51111560 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 51111560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60687360).

51111560 is an abundant number, since it is smaller than the sum of its proper divisors (70263160).

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

51111560 is a wasteful number, since it uses less digits than its factorization.

51111560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 962 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 51111560 is about 7149.2349241020. The cubic root of 51111560 is about 371.1131802812.

Adding to 51111560 its reverse (6511115), we get a palindrome (57622675).

The spelling of 51111560 in words is "fifty-one million, one hundred eleven thousand, five hundred sixty".