521670 has 16 divisors (see below), whose sum is σ = 1252080. Its totient is φ = 139104.

The previous prime is 521669. The next prime is 521671. The reversal of 521670 is 76125.

It is an interprime number because it is at equal distance from previous prime (521669) and next prime (521671).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521671) 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, 8665 + ... + 8724.

It is an arithmetic number, because the mean of its divisors is an integer number (78255).

2⁵²¹⁶⁷⁰ is an apocalyptic number.

521670 is an abundant number, since it is smaller than the sum of its proper divisors (730410).

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

521670 is a wasteful number, since it uses less digits than its factorization.

521670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17399.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 521670 is about 722.2672635528. The cubic root of 521670 is about 80.5005079504.

Adding to 521670 its reverse (76125), we get a palindrome (597795).

The spelling of 521670 in words is "five hundred twenty-one thousand, six hundred seventy".