331540987220 has 12 divisors (see below), whose sum is σ = 696236073204. Its totient is φ = 132616394880.

The previous prime is 331540987201. The next prime is 331540987223. The reversal of 331540987220 is 22789045133.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 158948931856 + 172592055364 = 398684^2 + 415442^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (331540987223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8288524661 + ... + 8288524700.

It is an arithmetic number, because the mean of its divisors is an integer number (58019672767).

Almost surely, 2^331540987220 is an apocalyptic number.

It is an amenable number.

331540987220 is an abundant number, since it is smaller than the sum of its proper divisors (364695085984).

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

331540987220 is a wasteful number, since it uses less digits than its factorization.

331540987220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16577049370 (or 16577049368 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 331540987220 in words is "three hundred thirty-one billion, five hundred forty million, nine hundred eighty-seven thousand, two hundred twenty".