31113440320 has 28 divisors (see below), whose sum is σ = 74088880524. Its totient is φ = 12445376000.

The previous prime is 31113440317. The next prime is 31113440321. The reversal of 31113440320 is 2304431113.

It can be written as a sum of positive squares in 2 ways, for example, as 7510648896 + 23602791424 = 86664^2 + 153632^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31113440291 and 31113440300.

It is not an unprimeable number, because it can be changed into a prime (31113440321) 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, 48614431 + ... + 48615070.

Almost surely, 2^31113440320 is an apocalyptic number.

It is an amenable number.

31113440320 is an abundant number, since it is smaller than the sum of its proper divisors (42975440204).

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

31113440320 is an equidigital number, since it uses as much as digits as its factorization.

31113440320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97229518 (or 97229508 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 31113440320 its reverse (2304431113), we get a palindrome (33417871433).

The spelling of 31113440320 in words is "thirty-one billion, one hundred thirteen million, four hundred forty thousand, three hundred twenty".