521966 has 4 divisors (see below), whose sum is σ = 782952. Its totient is φ = 260982.

The previous prime is 521929. The next prime is 521981. The reversal of 521966 is 669125.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130490 + ... + 130493.

It is an arithmetic number, because the mean of its divisors is an integer number (195738).

2⁵²¹⁹⁶⁶ is an apocalyptic number.

521966 is a deficient number, since it is larger than the sum of its proper divisors (260986).

521966 is a wasteful number, since it uses less digits than its factorization.

521966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260985.

The product of its digits is 3240, while the sum is 29.

The square root of 521966 is about 722.4721447918. The cubic root of 521966 is about 80.5157306295.

The spelling of 521966 in words is "five hundred twenty-one thousand, nine hundred sixty-six".