51012520 has 32 divisors (see below), whose sum is σ = 123608520. Its totient is φ = 18835200.

The previous prime is 51012517. The next prime is 51012581. The reversal of 51012520 is 2521015.

It can be written as a sum of positive squares in 4 ways, for example, as 18818244 + 32194276 = 4338^2 + 5674^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51012494 and 51012503.

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 7 ways as a sum of consecutive naturals, for example, 48531 + ... + 49570.

Almost surely, 2^51012520 is an apocalyptic number.

It is an amenable number.

51012520 is an abundant number, since it is smaller than the sum of its proper divisors (72596000).

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

51012520 is a wasteful number, since it uses less digits than its factorization.

51012520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98125 (or 98121 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 51012520 is about 7142.3049500844. The cubic root of 51012520 is about 370.8733205488.

Adding to 51012520 its reverse (2521015), we get a palindrome (53533535).

The spelling of 51012520 in words is "fifty-one million, twelve thousand, five hundred twenty".