51361140 has 48 divisors (see below), whose sum is σ = 144789120. Its totient is φ = 13603200.

The previous prime is 51361129. The next prime is 51361153. The reversal of 51361140 is 4116315.

It is a congruent number.

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, 6226 + ... + 11894.

It is an arithmetic number, because the mean of its divisors is an integer number (3016440).

Almost surely, 2^51361140 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 51361140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72394560).

51361140 is an abundant number, since it is smaller than the sum of its proper divisors (93427980).

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

51361140 is a wasteful number, since it uses less digits than its factorization.

51361140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5832 (or 5830 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 51361140 is about 7166.6686821703. The cubic root of 51361140 is about 371.7162537372.

Adding to 51361140 its reverse (4116315), we get a palindrome (55477455).

The spelling of 51361140 in words is "fifty-one million, three hundred sixty-one thousand, one hundred forty".