525131440 has 20 divisors (see below), whose sum is σ = 1220930784. Its totient is φ = 210052544.

The previous prime is 525131401. The next prime is 525131459. The reversal of 525131440 is 44131525.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3281992 + ... + 3282151.

Almost surely, 2^525131440 is an apocalyptic number.

It is an amenable number.

525131440 is an abundant number, since it is smaller than the sum of its proper divisors (695799344).

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

525131440 is a wasteful number, since it uses less digits than its factorization.

525131440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6564156 (or 6564150 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 525131440 is about 22915.7465512254. The cubic root of 525131440 is about 806.7816409061.

Adding to 525131440 its reverse (44131525), we get a palindrome (569262965).

The spelling of 525131440 in words is "five hundred twenty-five million, one hundred thirty-one thousand, four hundred forty".