31123131130 has 64 divisors (see below), whose sum is σ = 68973327360. Its totient is φ = 9846584064.

The previous prime is 31123131103. The next prime is 31123131173. The reversal of 31123131130 is 3113132113.

It is a junction number, because it is equal to n+sod(n) for n = 31123131098 and 31123131107.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5019192 + ... + 5025388.

It is an arithmetic number, because the mean of its divisors is an integer number (1077708240).

Almost surely, 2^31123131130 is an apocalyptic number.

31123131130 is an abundant number, since it is smaller than the sum of its proper divisors (37850196230).

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

31123131130 is a wasteful number, since it uses less digits than its factorization.

31123131130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11743.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31123131130 its reverse (3113132113), we get a palindrome (34236263243).

The spelling of 31123131130 in words is "thirty-one billion, one hundred twenty-three million, one hundred thirty-one thousand, one hundred thirty".