521041540 has 48 divisors (see below), whose sum is σ = 1143942912. Its totient is φ = 198974336.

The previous prime is 521041537. The next prime is 521041553. The reversal of 521041540 is 45140125.

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, 407382 + ... + 408658.

It is an arithmetic number, because the mean of its divisors is an integer number (23832144).

Almost surely, 2^521041540 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 521041540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (571971456).

521041540 is an abundant number, since it is smaller than the sum of its proper divisors (622901372).

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

521041540 is a wasteful number, since it uses less digits than its factorization.

521041540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196 (or 2194 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 521041540 is about 22826.3343531107. The cubic root of 521041540 is about 804.6816842625.

Adding to 521041540 its reverse (45140125), we get a palindrome (566181665).

The spelling of 521041540 in words is "five hundred twenty-one million, forty-one thousand, five hundred forty".