51931040 has 96 divisors (see below), whose sum is σ = 141523200. Its totient is φ = 17639424.

The previous prime is 51931037. The next prime is 51931063. The reversal of 51931040 is 4013915.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51930997 and 51931015.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 222764 + ... + 222996.

It is an arithmetic number, because the mean of its divisors is an integer number (1474200).

Almost surely, 2^51931040 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 51931040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70761600).

51931040 is an abundant number, since it is smaller than the sum of its proper divisors (89592160).

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

51931040 is a wasteful number, since it uses less digits than its factorization.

51931040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 23.

The square root of 51931040 is about 7206.3194489281. The cubic root of 51931040 is about 373.0860465570.

Adding to 51931040 its reverse (4013915), we get a palindrome (55944955).

The spelling of 51931040 in words is "fifty-one million, nine hundred thirty-one thousand, forty".