51425530 has 16 divisors (see below), whose sum is σ = 99686664. Its totient is φ = 18987840.

The previous prime is 51425489. The next prime is 51425551. The reversal of 51425530 is 3552415.

It can be written as a sum of positive squares in 4 ways, for example, as 14130081 + 37295449 = 3759^2 + 6107^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51425495 and 51425504.

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, 197661 + ... + 197920.

Almost surely, 2^51425530 is an apocalyptic number.

51425530 is a deficient number, since it is larger than the sum of its proper divisors (48261134).

51425530 is a wasteful number, since it uses less digits than its factorization.

51425530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395601.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 51425530 is about 7171.1595993953. The cubic root of 51425530 is about 371.8715255660.

Adding to 51425530 its reverse (3552415), we get a palindrome (54977945).

The spelling of 51425530 in words is "fifty-one million, four hundred twenty-five thousand, five hundred thirty".