521867 has 4 divisors (see below), whose sum is σ = 527136. Its totient is φ = 516600.

The previous prime is 521861. The next prime is 521869. The reversal of 521867 is 768125.

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 521867 - 2¹⁸ = 259723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (521861) 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, 2483 + ... + 2684.

It is an arithmetic number, because the mean of its divisors is an integer number (131784).

2⁵²¹⁸⁶⁷ is an apocalyptic number.

521867 is a deficient number, since it is larger than the sum of its proper divisors (5269).

521867 is a wasteful number, since it uses less digits than its factorization.

521867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5268.

The product of its digits is 3360, while the sum is 29.

The square root of 521867 is about 722.4036267905. The cubic root of 521867 is about 80.5106399012.

The spelling of 521867 in words is "five hundred twenty-one thousand, eight hundred sixty-seven".