31106108561 has 32 divisors (see below), whose sum is σ = 34924055040. Its totient is φ = 27466387200.

The previous prime is 31106108483. The next prime is 31106108591. The reversal of 31106108561 is 16580160113.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31106108561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31106108591) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38354846 + ... + 38355656.

It is an arithmetic number, because the mean of its divisors is an integer number (1091376720).

Almost surely, 2^31106108561 is an apocalyptic number.

It is an amenable number.

31106108561 is a deficient number, since it is larger than the sum of its proper divisors (3817946479).

31106108561 is a wasteful number, since it uses less digits than its factorization.

31106108561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517.

The product of its (nonzero) digits is 4320, while the sum is 32.

Adding to 31106108561 its reverse (16580160113), we get a palindrome (47686268674).

The spelling of 31106108561 in words is "thirty-one billion, one hundred six million, one hundred eight thousand, five hundred sixty-one".