531221450440 has 32 divisors (see below), whose sum is σ = 1195274578680. Its totient is φ = 212483901952.

The previous prime is 531221450429. The next prime is 531221450453. The reversal of 531221450440 is 44054122135.

It can be written as a sum of positive squares in 4 ways, for example, as 387478860484 + 143742589956 = 622478^2 + 379134^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2131404 + ... + 2367556.

Almost surely, 2^531221450440 is an apocalyptic number.

It is an amenable number.

531221450440 is an abundant number, since it is smaller than the sum of its proper divisors (664053128240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531221450440 is a wasteful number, since it uses less digits than its factorization.

531221450440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292401 (or 292397 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 31.

Adding to 531221450440 its reverse (44054122135), we get a palindrome (575275572575).

The spelling of 531221450440 in words is "five hundred thirty-one billion, two hundred twenty-one million, four hundred fifty thousand, four hundred forty".