51061540 has 48 divisors (see below), whose sum is σ = 114307200. Its totient is φ = 19092992.

The previous prime is 51061519. The next prime is 51061553. The reversal of 51061540 is 4516015.

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, 60441 + ... + 61279.

It is an arithmetic number, because the mean of its divisors is an integer number (2381400).

Almost surely, 2^51061540 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 51061540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57153600).

51061540 is an abundant number, since it is smaller than the sum of its proper divisors (63245660).

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

51061540 is a wasteful number, since it uses less digits than its factorization.

51061540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1042 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 51061540 is about 7145.7357913654. The cubic root of 51061540 is about 370.9920782571.

Adding to 51061540 its reverse (4516015), we get a palindrome (55577555).

The spelling of 51061540 in words is "fifty-one million, sixty-one thousand, five hundred forty".