531921 has 16 divisors (see below), whose sum is σ = 798336. Its totient is φ = 312576.

The previous prime is 531919. The next prime is 531977. The reversal of 531921 is 129135.

It is not a de Polignac number, because 531921 - 2¹ = 531919 is a prime.

531921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (531901) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 601 + ... + 1193.

It is an arithmetic number, because the mean of its divisors is an integer number (49896).

2⁵³¹⁹²¹ is an apocalyptic number.

It is an amenable number.

531921 is a deficient number, since it is larger than the sum of its proper divisors (266415).

531921 is a wasteful number, since it uses less digits than its factorization.

531921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632.

The product of its digits is 270, while the sum is 21.

The square root of 531921 is about 729.3291438027. The cubic root of 531921 is about 81.0243791881.

The spelling of 531921 in words is "five hundred thirty-one thousand, nine hundred twenty-one".