31123081861672 has 64 divisors (see below), whose sum is σ = 63553444344000. Its totient is φ = 14232328395264.

The previous prime is 31123081861661. The next prime is 31123081861679. The reversal of 31123081861672 is 27616818032113.

It is not an unprimeable number, because it can be changed into a prime (31123081861679) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34300428 + ... + 35196100.

It is an arithmetic number, because the mean of its divisors is an integer number (993022567875).

Almost surely, 2^{31123081861672} is an apocalyptic number.

It is an amenable number.

31123081861672 is an abundant number, since it is smaller than the sum of its proper divisors (32430362482328).

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

31123081861672 is a wasteful number, since it uses less digits than its factorization.

31123081861672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903610 (or 903606 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

Adding to 31123081861672 its reverse (27616818032113), we get a palindrome (58739899893785).

The spelling of 31123081861672 in words is "thirty-one trillion, one hundred twenty-three billion, eighty-one million, eight hundred sixty-one thousand, six hundred seventy-two".