31131403031020 has 24 divisors (see below), whose sum is σ = 65384742042144. Its totient is φ = 12450885845376.

The previous prime is 31131403031017. The next prime is 31131403031041. The reversal of 31131403031020 is 2013030413113.

It is a junction number, because it is equal to n+sod(n) for n = 31131403030982 and 31131403031000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104558064 + ... + 104855383.

It is an arithmetic number, because the mean of its divisors is an integer number (2724364251756).

Almost surely, 2^{31131403031020} is an apocalyptic number.

It is an amenable number.

31131403031020 is an abundant number, since it is smaller than the sum of its proper divisors (34253339011124).

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

31131403031020 is a wasteful number, since it uses less digits than its factorization.

31131403031020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209420889 (or 209420887 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31131403031020 its reverse (2013030413113), we get a palindrome (33144433444133).

The spelling of 31131403031020 in words is "thirty-one trillion, one hundred thirty-one billion, four hundred three million, thirty-one thousand, twenty".