31131023211999 has 6 divisors (see below), whose sum is σ = 44967033528456. Its totient is φ = 20754015474660.

The previous prime is 31131023211997. The next prime is 31131023212057. The reversal of 31131023211999 is 99911232013113.

31131023211999 is a `hidden beast` number, since 3 + 1 + 1 + 310 + 2 + 321 + 1 + 9 + 9 + 9 = 666.

It is not a de Polignac number, because 31131023211999 - 2¹ = 31131023211997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131023211997) 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 5 ways as a sum of consecutive naturals, for example, 1729501289547 + ... + 1729501289564.

It is an arithmetic number, because the mean of its divisors is an integer number (7494505588076).

Almost surely, 2^{31131023211999} is an apocalyptic number.

31131023211999 is a deficient number, since it is larger than the sum of its proper divisors (13836010316457).

31131023211999 is a wasteful number, since it uses less digits than its factorization.

31131023211999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3459002579117 (or 3459002579114 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The spelling of 31131023211999 in words is "thirty-one trillion, one hundred thirty-one billion, twenty-three million, two hundred eleven thousand, nine hundred ninety-nine".