525221040 has 160 divisors (see below), whose sum is σ = 1675607040. Its totient is φ = 136046592.

The previous prime is 525221027. The next prime is 525221063. The reversal of 525221040 is 40122525.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 525220998 and 525221016.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1430937 + ... + 1431303.

It is an arithmetic number, because the mean of its divisors is an integer number (10472544).

Almost surely, 2^525221040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 525221040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (837803520).

525221040 is an abundant number, since it is smaller than the sum of its proper divisors (1150386000).

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

525221040 is a wasteful number, since it uses less digits than its factorization.

525221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539 (or 533 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 525221040 is about 22917.7014554252. The cubic root of 525221040 is about 806.8275237198.

Adding to 525221040 its reverse (40122525), we get a palindrome (565343565).

The spelling of 525221040 in words is "five hundred twenty-five million, two hundred twenty-one thousand, forty".