31043320040 has 16 divisors (see below), whose sum is σ = 69847470180. Its totient is φ = 12417328000.

The previous prime is 31043319991. The next prime is 31043320043. The reversal of 31043320040 is 4002334013.

It can be written as a sum of positive squares in 2 ways, for example, as 31037278276 + 6041764 = 176174^2 + 2458^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31043319994 and 31043320021.

It is not an unprimeable number, because it can be changed into a prime (31043320043) by changing a digit.

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, 388041461 + ... + 388041540.

Almost surely, 2^31043320040 is an apocalyptic number.

It is an amenable number.

31043320040 is an abundant number, since it is smaller than the sum of its proper divisors (38804150140).

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

31043320040 is a wasteful number, since it uses less digits than its factorization.

31043320040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776083012 (or 776083008 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 31043320040 its reverse (4002334013), we get a palindrome (35045654053).

The spelling of 31043320040 in words is "thirty-one billion, forty-three million, three hundred twenty thousand, forty".