521011 has 4 divisors (see below), whose sum is σ = 524952. Its totient is φ = 517072.

The previous prime is 521009. The next prime is 521021. The reversal of 521011 is 110125.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 521011 - 2¹ = 521009 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (521021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1765 + ... + 2038.

It is an arithmetic number, because the mean of its divisors is an integer number (131238).

2⁵²¹⁰¹¹ is an apocalyptic number.

521011 is a deficient number, since it is larger than the sum of its proper divisors (3941).

521011 is a wasteful number, since it uses less digits than its factorization.

521011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3940.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 521011 is about 721.8109170690. The cubic root of 521011 is about 80.4665962254.

Adding to 521011 its reverse (110125), we get a palindrome (631136).

The spelling of 521011 in words is "five hundred twenty-one thousand, eleven".