31123203112 has 16 divisors (see below), whose sum is σ = 60893223840. Its totient is φ = 14885010096.

The previous prime is 31123203049. The next prime is 31123203121. The reversal of 31123203112 is 21130232113.

It is a self number, because there is not a number n which added to its sum of digits gives 31123203112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84573738 + ... + 84574105.

It is an arithmetic number, because the mean of its divisors is an integer number (3805826490).

Almost surely, 2^31123203112 is an apocalyptic number.

It is an amenable number.

31123203112 is a deficient number, since it is larger than the sum of its proper divisors (29770020728).

31123203112 is a wasteful number, since it uses less digits than its factorization.

31123203112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169147872 (or 169147868 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31123203112 its reverse (21130232113), we get a palindrome (52253435225).

The spelling of 31123203112 in words is "thirty-one billion, one hundred twenty-three million, two hundred three thousand, one hundred twelve".