531271221 has 16 divisors (see below), whose sum is σ = 779084544. Its totient is φ = 319978944.

The previous prime is 531271189. The next prime is 531271229. The reversal of 531271221 is 122172135.

It is not a de Polignac number, because 531271221 - 2⁵ = 531271189 is a prime.

It is a super-2 number, since 2×531271221² = 564498220525661682, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 531271191 and 531271200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531271229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 143086 + ... + 146751.

It is an arithmetic number, because the mean of its divisors is an integer number (48692784).

Almost surely, 2^531271221 is an apocalyptic number.

It is an amenable number.

531271221 is a deficient number, since it is larger than the sum of its proper divisors (247813323).

531271221 is a wasteful number, since it uses less digits than its factorization.

531271221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289900.

The product of its digits is 840, while the sum is 24.

The square root of 531271221 is about 23049.3214867596. The cubic root of 531271221 is about 809.9137341447.

The spelling of 531271221 in words is "five hundred thirty-one million, two hundred seventy-one thousand, two hundred twenty-one".