31123430012 has 24 divisors (see below), whose sum is σ = 54799285632. Its totient is φ = 15466593600.

The previous prime is 31123430011. The next prime is 31123430047. The reversal of 31123430012 is 21003432113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31123430011) 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, 1308062 + ... + 1331642.

It is an arithmetic number, because the mean of its divisors is an integer number (2283303568).

Almost surely, 2^31123430012 is an apocalyptic number.

It is an amenable number.

31123430012 is a deficient number, since it is larger than the sum of its proper divisors (23675855620).

31123430012 is a wasteful number, since it uses less digits than its factorization.

31123430012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25589 (or 25587 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31123430012 its reverse (21003432113), we get a palindrome (52126862125).

The spelling of 31123430012 in words is "thirty-one billion, one hundred twenty-three million, four hundred thirty thousand, twelve".