531225221 has 4 divisors (see below), whose sum is σ = 532241472. Its totient is φ = 530208972.

The previous prime is 531225217. The next prime is 531225229. The reversal of 531225221 is 122522135.

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 a cyclic number.

It is not a de Polignac number, because 531225221 - 2² = 531225217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531225229) 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 3 ways as a sum of consecutive naturals, for example, 507341 + ... + 508386.

It is an arithmetic number, because the mean of its divisors is an integer number (133060368).

Almost surely, 2^531225221 is an apocalyptic number.

It is an amenable number.

531225221 is a deficient number, since it is larger than the sum of its proper divisors (1016251).

531225221 is a wasteful number, since it uses less digits than its factorization.

531225221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016250.

The product of its digits is 1200, while the sum is 23.

The square root of 531225221 is about 23048.3236049826. The cubic root of 531225221 is about 809.8903580701.

Adding to 531225221 its reverse (122522135), we get a palindrome (653747356).

The spelling of 531225221 in words is "five hundred thirty-one million, two hundred twenty-five thousand, two hundred twenty-one".