31131111111101 has 4 divisors (see below), whose sum is σ = 31217827298400. Its totient is φ = 31044394923804.

The previous prime is 31131111111019. The next prime is 31131111111167. The reversal of 31131111111101 is 10111111113113.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31131111111101 is a prime.

It is a super-2 number, since 2×31131111111101² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31131111111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131111111701) 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 3 ways as a sum of consecutive naturals, for example, 43358093111 + ... + 43358093828.

It is an arithmetic number, because the mean of its divisors is an integer number (7804456824600).

Almost surely, 2^{31131111111101} is an apocalyptic number.

It is an amenable number.

31131111111101 is a deficient number, since it is larger than the sum of its proper divisors (86716187299).

31131111111101 is an equidigital number, since it uses as much as digits as its factorization.

31131111111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86716187298.

The product of its (nonzero) digits is 9, while the sum is 17.

Adding to 31131111111101 its reverse (10111111113113), we get a palindrome (41242222224214).

The spelling of 31131111111101 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred one".