51042500 has 60 divisors (see below), whose sum is σ = 118284012. Its totient is φ = 19200000.

The previous prime is 51042491. The next prime is 51042521. The reversal of 51042500 is 524015.

It can be written as a sum of positive squares in 10 ways, for example, as 47224384 + 3818116 = 6872^2 + 1954^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

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 19 ways as a sum of consecutive naturals, for example, 41900 + ... + 43100.

Almost surely, 2^51042500 is an apocalyptic number.

51042500 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 51042500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59142006).

51042500 is an abundant number, since it is smaller than the sum of its proper divisors (67241512).

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

51042500 is a wasteful number, since it uses less digits than its factorization.

51042500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242 (or 1225 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 51042500 is about 7144.4034040639. The cubic root of 51042500 is about 370.9459602635.

Adding to 51042500 its reverse (524015), we get a palindrome (51566515).

The spelling of 51042500 in words is "fifty-one million, forty-two thousand, five hundred".