51409530 has 48 divisors (see below), whose sum is σ = 141531624. Its totient is φ = 12902400.

The previous prime is 51409511. The next prime is 51409543. The reversal of 51409530 is 3590415.

It can be written as a sum of positive squares in 4 ways, for example, as 31775769 + 19633761 = 5637^2 + 4431^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51409494 and 51409503.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15271 + ... + 18330.

Almost surely, 2^51409530 is an apocalyptic number.

51409530 is an abundant number, since it is smaller than the sum of its proper divisors (90122094).

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

51409530 is a wasteful number, since it uses less digits than its factorization.

51409530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33631 (or 33628 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 51409530 is about 7170.0439329198. The cubic root of 51409530 is about 371.8329548303.

Adding to 51409530 its reverse (3590415), we get a palindrome (54999945).

The spelling of 51409530 in words is "fifty-one million, four hundred nine thousand, five hundred thirty".