521971 has 8 divisors (see below), whose sum is σ = 554400. Its totient is φ = 490560.

The previous prime is 521929. The next prime is 521981. The reversal of 521971 is 179125.

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

It is a cyclic number.

It is not a de Polignac number, because 521971 - 2¹¹ = 519923 is a prime.

It is a Duffinian number.

521971 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (521981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 970 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (69300).

2⁵²¹⁹⁷¹ is an apocalyptic number.

521971 is a deficient number, since it is larger than the sum of its proper divisors (32429).

521971 is a wasteful number, since it uses less digits than its factorization.

521971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509.

The product of its digits is 630, while the sum is 25.

The square root of 521971 is about 722.4756051245. The cubic root of 521971 is about 80.5159877200.

The spelling of 521971 in words is "five hundred twenty-one thousand, nine hundred seventy-one".