31211031103 has 4 divisors (see below), whose sum is σ = 35669749840. Its totient is φ = 26752312368.

The previous prime is 31211031041. The next prime is 31211031113. The reversal of 31211031103 is 30113011213.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31211031103 - 2²⁹ = 30674160191 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 (31211031113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2229359358 + ... + 2229359371.

It is an arithmetic number, because the mean of its divisors is an integer number (8917437460).

Almost surely, 2^31211031103 is an apocalyptic number.

31211031103 is a deficient number, since it is larger than the sum of its proper divisors (4458718737).

31211031103 is an equidigital number, since it uses as much as digits as its factorization.

31211031103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4458718736.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 31211031103 its reverse (30113011213), we get a palindrome (61324042316).

The spelling of 31211031103 in words is "thirty-one billion, two hundred eleven million, thirty-one thousand, one hundred three".