51561060 has 96 divisors (see below), whose sum is σ = 156979200. Its totient is φ = 12597120.

The previous prime is 51561049. The next prime is 51561061. The reversal of 51561060 is 6016515.

It is a self number, because there is not a number n which added to its sum of digits gives 51561060.

It is not an unprimeable number, because it can be changed into a prime (51561061) 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, 34611 + ... + 36069.

It is an arithmetic number, because the mean of its divisors is an integer number (1635200).

Almost surely, 2^51561060 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 51561060, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78489600).

51561060 is an abundant number, since it is smaller than the sum of its proper divisors (105418140).

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

51561060 is a wasteful number, since it uses less digits than its factorization.

51561060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521 (or 1519 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 51561060 is about 7180.6030387426. The cubic root of 51561060 is about 372.1979233496.

Adding to 51561060 its reverse (6016515), we get a palindrome (57577575).

It can be divided in two parts, 5156 and 1060, that added together give a triangular number (6216 = T₁₁₁).

The spelling of 51561060 in words is "fifty-one million, five hundred sixty-one thousand, sixty".