31121610712171 has 4 divisors (see below), whose sum is σ = 35567555099632. Its totient is φ = 26675666324712.

The previous prime is 31121610712163. The next prime is 31121610712261. The reversal of 31121610712171 is 17121701612113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31121610712171 - 2³ = 31121610712163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31121610712121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2222972193720 + ... + 2222972193733.

It is an arithmetic number, because the mean of its divisors is an integer number (8891888774908).

Almost surely, 2^{31121610712171} is an apocalyptic number.

31121610712171 is a deficient number, since it is larger than the sum of its proper divisors (4445944387461).

31121610712171 is an equidigital number, since it uses as much as digits as its factorization.

31121610712171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4445944387460.

The product of its (nonzero) digits is 3528, while the sum is 34.

The spelling of 31121610712171 in words is "thirty-one trillion, one hundred twenty-one billion, six hundred ten million, seven hundred twelve thousand, one hundred seventy-one".