31111101101005 has 32 divisors (see below), whose sum is σ = 37872108938880. Its totient is φ = 24532170547200.

The previous prime is 31111101100997. The next prime is 31111101101107. The reversal of 31111101101005 is 50010110111113.

It is not a de Polignac number, because 31111101101005 - 2³ = 31111101100997 is a prime.

It is a super-2 number, since 2×31111101101005² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31111101101005.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 194353441 + ... + 194513449.

It is an arithmetic number, because the mean of its divisors is an integer number (1183503404340).

Almost surely, 2^{31111101101005} is an apocalyptic number.

It is an amenable number.

31111101101005 is a deficient number, since it is larger than the sum of its proper divisors (6761007837875).

31111101101005 is a wasteful number, since it uses less digits than its factorization.

31111101101005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161949.

The product of its (nonzero) digits is 15, while the sum is 16.

Adding to 31111101101005 its reverse (50010110111113), we get a palindrome (81121211212118).

The spelling of 31111101101005 in words is "thirty-one trillion, one hundred eleven billion, one hundred one million, one hundred one thousand, five".