31313103113 has 4 divisors (see below), whose sum is σ = 31343773188. Its totient is φ = 31282433040.

The previous prime is 31313103077. The next prime is 31313103127. The reversal of 31313103113 is 31130131313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31130131313 = 397 ⋅78413429.

It can be written as a sum of positive squares in 2 ways, for example, as 8030310544 + 23282792569 = 89612^2 + 152587^2 .

It is a cyclic number.

It is not a de Polignac number, because 31313103113 - 2³⁴ = 14133233929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31313103163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15333506 + ... + 15335547.

It is an arithmetic number, because the mean of its divisors is an integer number (7835943297).

Almost surely, 2^31313103113 is an apocalyptic number.

It is an amenable number.

31313103113 is a deficient number, since it is larger than the sum of its proper divisors (30670075).

31313103113 is a wasteful number, since it uses less digits than its factorization.

31313103113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30670074.

The product of its (nonzero) digits is 243, while the sum is 20.

Adding to 31313103113 its reverse (31130131313), we get a palindrome (62443234426).

The spelling of 31313103113 in words is "thirty-one billion, three hundred thirteen million, one hundred three thousand, one hundred thirteen".