531173220 has 96 divisors (see below), whose sum is σ = 1541514240. Its totient is φ = 136519680.

The previous prime is 531173219. The next prime is 531173231. The reversal of 531173220 is 22371135.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 656176 + ... + 656984.

It is an arithmetic number, because the mean of its divisors is an integer number (16057440).

Almost surely, 2^531173220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 531173220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (770757120).

531173220 is an abundant number, since it is smaller than the sum of its proper divisors (1010341020).

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

531173220 is a wasteful number, since it uses less digits than its factorization.

531173220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1205 (or 1203 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 531173220 is about 23047.1954909920. The cubic root of 531173220 is about 809.8639308091.

The spelling of 531173220 in words is "five hundred thirty-one million, one hundred seventy-three thousand, two hundred twenty".