31103321113 has 4 divisors (see below), whose sum is σ = 31112290660. Its totient is φ = 31094351568.

The previous prime is 31103321089. The next prime is 31103321143. The reversal of 31103321113 is 31112330113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31112330113 = 2447 ⋅12714479.

It can be written as a sum of positive squares in 2 ways, for example, as 13889093904 + 17214227209 = 117852^2 + 131203^2 .

It is a cyclic number.

It is not a de Polignac number, because 31103321113 - 2²¹ = 31101223961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31103321143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4479570 + ... + 4486507.

It is an arithmetic number, because the mean of its divisors is an integer number (7778072665).

Almost surely, 2^31103321113 is an apocalyptic number.

It is an amenable number.

31103321113 is a deficient number, since it is larger than the sum of its proper divisors (8969547).

31103321113 is an equidigital number, since it uses as much as digits as its factorization.

31103321113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8969546.

The product of its (nonzero) digits is 162, while the sum is 19.

Adding to 31103321113 its reverse (31112330113), we get a palindrome (62215651226).

The spelling of 31103321113 in words is "thirty-one billion, one hundred three million, three hundred twenty-one thousand, one hundred thirteen".