31123101012 has 48 divisors (see below), whose sum is σ = 76513382400. Its totient is φ = 9819260640.

The previous prime is 31123101011. The next prime is 31123101019. The reversal of 31123101012 is 21010132113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31123100982 and 31123101000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123101011) 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 15 ways as a sum of consecutive naturals, for example, 186189 + ... + 311307.

It is an arithmetic number, because the mean of its divisors is an integer number (1594028800).

Almost surely, 2^31123101012 is an apocalyptic number.

It is an amenable number.

31123101012 is an abundant number, since it is smaller than the sum of its proper divisors (45390281388).

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

31123101012 is a wasteful number, since it uses less digits than its factorization.

31123101012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126236 (or 126234 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31123101012 its reverse (21010132113), we get a palindrome (52133233125).

The spelling of 31123101012 in words is "thirty-one billion, one hundred twenty-three million, one hundred one thousand, twelve".