521716 has 24 divisors (see below), whose sum is σ = 1003520. Its totient is φ = 235872.

The previous prime is 521707. The next prime is 521723. The reversal of 521716 is 617125.

521716 = 39² + 40² + ... + 117².

521716 is a modest number, since divided by 1716 gives 52 as remainder.

It is a zygodrome in base 3.

It is a congruent number.

It is an unprimeable number.

521716 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4045 + ... + 4171.

2⁵²¹⁷¹⁶ is an apocalyptic number.

It is an amenable number.

521716 is a deficient number, since it is larger than the sum of its proper divisors (481804).

521716 is a wasteful number, since it uses less digits than its factorization.

521716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223 (or 221 counting only the distinct ones).

The product of its digits is 420, while the sum is 22.

The square root of 521716 is about 722.2991070187. The cubic root of 521716 is about 80.5028740149.

The spelling of 521716 in words is "five hundred twenty-one thousand, seven hundred sixteen".