31530225520 has 20 divisors (see below), whose sum is σ = 73307774520. Its totient is φ = 12612090176.

The previous prime is 31530225511. The next prime is 31530225557. The reversal of 31530225520 is 2552203513.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×31530225520³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197063830 + ... + 197063989.

It is an arithmetic number, because the mean of its divisors is an integer number (3665388726).

Almost surely, 2^31530225520 is an apocalyptic number.

It is an amenable number.

31530225520 is an abundant number, since it is smaller than the sum of its proper divisors (41777549000).

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

31530225520 is a wasteful number, since it uses less digits than its factorization.

31530225520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394127832 (or 394127826 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The spelling of 31530225520 in words is "thirty-one billion, five hundred thirty million, two hundred twenty-five thousand, five hundred twenty".