531021 has 4 divisors (see below), whose sum is σ = 708032. Its totient is φ = 354012.

The previous prime is 531017. The next prime is 531023. The reversal of 531021 is 120135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 531021 - 2² = 531017 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 530988 and 531006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88501 + ... + 88506.

It is an arithmetic number, because the mean of its divisors is an integer number (177008).

2⁵³¹⁰²¹ is an apocalyptic number.

It is an amenable number.

531021 is a deficient number, since it is larger than the sum of its proper divisors (177011).

531021 is a wasteful number, since it uses less digits than its factorization.

531021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177010.

The product of its (nonzero) digits is 30, while the sum is 12.

The square root of 531021 is about 728.7118772190. The cubic root of 531021 is about 80.9786561657.

Adding to 531021 its reverse (120135), we get a palindrome (651156).

The spelling of 531021 in words is "five hundred thirty-one thousand, twenty-one".