51025540 has 24 divisors (see below), whose sum is σ = 108624600. Its totient is φ = 20130048.

The previous prime is 51025537. The next prime is 51025567. The reversal of 51025540 is 4552015.

It can be written as a sum of positive squares in 4 ways, for example, as 217156 + 50808384 = 466^2 + 7128^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16015 + ... + 18934.

It is an arithmetic number, because the mean of its divisors is an integer number (4526025).

Almost surely, 2^51025540 is an apocalyptic number.

It is an amenable number.

51025540 is an abundant number, since it is smaller than the sum of its proper divisors (57599060).

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

51025540 is a wasteful number, since it uses less digits than its factorization.

51025540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35031 (or 35029 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51025540 is about 7143.2163623959. The cubic root of 51025540 is about 370.9048707112.

Adding to 51025540 its reverse (4552015), we get a palindrome (55577555).

The spelling of 51025540 in words is "fifty-one million, twenty-five thousand, five hundred forty".