51450520 has 32 divisors (see below), whose sum is σ = 126288720. Its totient is φ = 18709120.

The previous prime is 51450493. The next prime is 51450527. The reversal of 51450520 is 2505415.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a junction number, because it is equal to n+sod(n) for n = 51450491 and 51450500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51450527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58027 + ... + 58906.

Almost surely, 2^51450520 is an apocalyptic number.

It is an amenable number.

51450520 is an abundant number, since it is smaller than the sum of its proper divisors (74838200).

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

51450520 is a wasteful number, since it uses less digits than its factorization.

51450520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116955 (or 116951 counting only the distinct ones).

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

The square root of 51450520 is about 7172.9017837971. The cubic root of 51450520 is about 371.9317522311.

Adding to 51450520 its reverse (2505415), we get a palindrome (53955935).

The spelling of 51450520 in words is "fifty-one million, four hundred fifty thousand, five hundred twenty".