521611 has 8 divisors (see below), whose sum is σ = 562464. Its totient is φ = 481920.

The previous prime is 521603. The next prime is 521641. The reversal of 521611 is 116125.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 521611 - 2³ = 521603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521641) 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 7 ways as a sum of consecutive naturals, for example, 786 + ... + 1288.

It is an arithmetic number, because the mean of its divisors is an integer number (70308).

2⁵²¹⁶¹¹ is an apocalyptic number.

521611 is a deficient number, since it is larger than the sum of its proper divisors (40853).

521611 is a wasteful number, since it uses less digits than its factorization.

521611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581.

The product of its digits is 60, while the sum is 16.

The square root of 521611 is about 722.2264187912. The cubic root of 521611 is about 80.4974730120.

Adding to 521611 its reverse (116125), we get a palindrome (637736).

The spelling of 521611 in words is "five hundred twenty-one thousand, six hundred eleven".