31311332320 has 48 divisors (see below), whose sum is σ = 75546934848. Its totient is φ = 12258050560.

The previous prime is 31311332293. The next prime is 31311332329. The reversal of 31311332320 is 2323311313.

It is a junction number, because it is equal to n+sod(n) for n = 31311332291 and 31311332300.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311332329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2074351 + ... + 2089390.

It is an arithmetic number, because the mean of its divisors is an integer number (1573894476).

Almost surely, 2^31311332320 is an apocalyptic number.

It is an amenable number.

31311332320 is an abundant number, since it is smaller than the sum of its proper divisors (44235602528).

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

31311332320 is a wasteful number, since it uses less digits than its factorization.

31311332320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4163803 (or 4163795 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31311332320 its reverse (2323311313), we get a palindrome (33634643633).

The spelling of 31311332320 in words is "thirty-one billion, three hundred eleven million, three hundred thirty-two thousand, three hundred twenty".