521531140 has 48 divisors (see below), whose sum is σ = 1194439680. Its totient is φ = 190120320.

The previous prime is 521531137. The next prime is 521531159. The reversal of 521531140 is 41135125.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7845 + ... + 33235.

It is an arithmetic number, because the mean of its divisors is an integer number (24884160).

Almost surely, 2^521531140 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 521531140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (597219840).

521531140 is an abundant number, since it is smaller than the sum of its proper divisors (672908540).

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

521531140 is a wasteful number, since it uses less digits than its factorization.

521531140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25492 (or 25490 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 521531140 is about 22837.0562901614. The cubic root of 521531140 is about 804.9336467820.

Adding to 521531140 its reverse (41135125), we get a palindrome (562666265).

The spelling of 521531140 in words is "five hundred twenty-one million, five hundred thirty-one thousand, one hundred forty".