51520425 has 48 divisors (see below), whose sum is σ = 93690432. Its totient is φ = 24774400.

The previous prime is 51520423. The next prime is 51520439. The reversal of 51520425 is 52402515.

It is a happy number.

It is not a de Polignac number, because 51520425 - 2¹ = 51520423 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51520395 and 51520404.

It is not an unprimeable number, because it can be changed into a prime (51520423) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 162367 + ... + 162683.

It is an arithmetic number, because the mean of its divisors is an integer number (1951884).

Almost surely, 2^51520425 is an apocalyptic number.

51520425 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51520425 is a deficient number, since it is larger than the sum of its proper divisors (42170007).

51520425 is a wasteful number, since it uses less digits than its factorization.

51520425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 538 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 51520425 is about 7177.7729833145. The cubic root of 51520425 is about 372.1001219114.

The spelling of 51520425 in words is "fifty-one million, five hundred twenty thousand, four hundred twenty-five".