521166 has 8 divisors (see below), whose sum is σ = 1042344. Its totient is φ = 173720.

The previous prime is 521161. The next prime is 521167. The reversal of 521166 is 661125.

It is a happy number.

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

521166 is an admirable number.

It is a super-2 number, since 2×521166² = 543227999112, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521161) by changing a digit.

521166 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 3 ways as a sum of consecutive naturals, for example, 43425 + ... + 43436.

It is an arithmetic number, because the mean of its divisors is an integer number (130293).

2⁵²¹¹⁶⁶ is an apocalyptic number.

521166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

521166 is a wasteful number, since it uses less digits than its factorization.

521166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86866.

The product of its digits is 360, while the sum is 21.

The square root of 521166 is about 721.9182779235. The cubic root of 521166 is about 80.4745749986.

The spelling of 521166 in words is "five hundred twenty-one thousand, one hundred sixty-six".