25431530 has 8 divisors (see below), whose sum is σ = 45776772. Its totient is φ = 10172608.

The previous prime is 25431517. The next prime is 25431569. The reversal of 25431530 is 3513452.

It can be written as a sum of positive squares in 2 ways, for example, as 25270729 + 160801 = 5027^2 + 401^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25431496 and 25431505.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1271567 + ... + 1271586.

Almost surely, 2^25431530 is an apocalyptic number.

25431530 is a deficient number, since it is larger than the sum of its proper divisors (20345242).

25431530 is a wasteful number, since it uses less digits than its factorization.

25431530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543160.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 25431530 is about 5042.9683719016. The cubic root of 25431530 is about 294.0745873354.

Adding to 25431530 its reverse (3513452), we get a palindrome (28944982).

The spelling of 25431530 in words is "twenty-five million, four hundred thirty-one thousand, five hundred thirty".