31131113211103 has 4 divisors (see below), whose sum is σ = 31131124484040. Its totient is φ = 31131101938168.

The previous prime is 31131113211041. The next prime is 31131113211131. The reversal of 31131113211103 is 30111231113113.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 31131113211103 - 2³⁷ = 30993674257631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31131113218103) 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, 1619493 + ... + 8055121.

It is an arithmetic number, because the mean of its divisors is an integer number (7782781121010).

Almost surely, 2^{31131113211103} is an apocalyptic number.

31131113211103 is a deficient number, since it is larger than the sum of its proper divisors (11272937).

31131113211103 is an equidigital number, since it uses as much as digits as its factorization.

31131113211103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11272936.

The product of its (nonzero) digits is 162, while the sum is 22.

Adding to 31131113211103 its reverse (30111231113113), we get a palindrome (61242344324216).

The spelling of 31131113211103 in words is "thirty-one trillion, one hundred thirty-one billion, one hundred thirteen million, two hundred eleven thousand, one hundred three".