51751000 has 64 divisors (see below), whose sum is σ = 138415680. Its totient is φ = 17740800.

The previous prime is 51750991. The next prime is 51751019. The reversal of 51751000 is 15715.

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, 3304 + ... + 10696.

It is an arithmetic number, because the mean of its divisors is an integer number (2162745).

Almost surely, 2^51751000 is an apocalyptic number.

51751000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51751000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69207840).

51751000 is an abundant number, since it is smaller than the sum of its proper divisors (86664680).

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

51751000 is a wasteful number, since it uses less digits than its factorization.

51751000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7421 (or 7407 counting only the distinct ones).

The product of its (nonzero) digits is 175, while the sum is 19.

The square root of 51751000 is about 7193.8167894380. The cubic root of 51751000 is about 372.6543960055.

Adding to 51751000 its reverse (15715), we get a palindrome (51766715).

The spelling of 51751000 in words is "fifty-one million, seven hundred fifty-one thousand".