51201140 has 12 divisors (see below), whose sum is σ = 107522436. Its totient is φ = 20480448.

The previous prime is 51201133. The next prime is 51201149. The reversal of 51201140 is 4110215.

It can be written as a sum of positive squares in 2 ways, for example, as 9572836 + 41628304 = 3094^2 + 6452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51201149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1280009 + ... + 1280048.

It is an arithmetic number, because the mean of its divisors is an integer number (8960203).

Almost surely, 2^51201140 is an apocalyptic number.

It is an amenable number.

51201140 is an abundant number, since it is smaller than the sum of its proper divisors (56321296).

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

51201140 is a wasteful number, since it uses less digits than its factorization.

51201140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560066 (or 2560064 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 51201140 is about 7155.4971874776. The cubic root of 51201140 is about 371.3298626119.

Adding to 51201140 its reverse (4110215), we get a palindrome (55311355).

The spelling of 51201140 in words is "fifty-one million, two hundred one thousand, one hundred forty".