31109111111 has 8 divisors (see below), whose sum is σ = 33961053840. Its totient is φ = 28322730432.

The previous prime is 31109111093. The next prime is 31109111129. The reversal of 31109111111 is 11111190113.

It is an interprime number because it is at equal distance from previous prime (31109111093) and next prime (31109111129).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31109111111 is a prime.

It is a Duffinian number.

31109111111 is a modest number, since divided by 111111 gives 31109 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31109111171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16389521 + ... + 16391418.

It is an arithmetic number, because the mean of its divisors is an integer number (4245131730).

Almost surely, 2^31109111111 is an apocalyptic number.

31109111111 is a deficient number, since it is larger than the sum of its proper divisors (2851942729).

31109111111 is a wasteful number, since it uses less digits than its factorization.

31109111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32781025.

The product of its (nonzero) digits is 27, while the sum is 20.

The spelling of 31109111111 in words is "thirty-one billion, one hundred nine million, one hundred eleven thousand, one hundred eleven".