31123430112 has 48 divisors (see below), whose sum is σ = 84516218640. Its totient is φ = 10016735232.

The previous prime is 31123430089. The next prime is 31123430113. The reversal of 31123430112 is 21103432113.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123430113) 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, 5586913 + ... + 5592480.

It is an arithmetic number, because the mean of its divisors is an integer number (1760754555).

Almost surely, 2^31123430112 is an apocalyptic number.

31123430112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31123430112 is an abundant number, since it is smaller than the sum of its proper divisors (53392788528).

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

31123430112 is a wasteful number, since it uses less digits than its factorization.

31123430112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11179435 (or 11179427 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 31123430112 its reverse (21103432113), we get a palindrome (52226862225).

The spelling of 31123430112 in words is "thirty-one billion, one hundred twenty-three million, four hundred thirty thousand, one hundred twelve".