51375530 has 48 divisors (see below), whose sum is σ = 101788920. Its totient is φ = 18643968.

The previous prime is 51375523. The next prime is 51375539. The reversal of 51375530 is 3557315.

It can be written as a sum of positive squares in 12 ways, for example, as 3530641 + 47844889 = 1879^2 + 6917^2 .

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a junction number, because it is equal to n+sod(n) for n = 51375493 and 51375502.

It is not an unprimeable number, because it can be changed into a prime (51375539) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83504 + ... + 84116.

Almost surely, 2^51375530 is an apocalyptic number.

51375530 is a deficient number, since it is larger than the sum of its proper divisors (50413390).

51375530 is a wasteful number, since it uses less digits than its factorization.

51375530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683 (or 666 counting only the distinct ones).

The product of its (nonzero) digits is 7875, while the sum is 29.

The square root of 51375530 is about 7167.6725650660. The cubic root of 51375530 is about 371.7509654370.

The spelling of 51375530 in words is "fifty-one million, three hundred seventy-five thousand, five hundred thirty".