31123313113 has 4 divisors (see below), whose sum is σ = 31203322020. Its totient is φ = 31043304208.

The previous prime is 31123313099. The next prime is 31123313141. The reversal of 31123313113 is 31131332113.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31131332113 = 7 ⋅4447333159.

It can be written as a sum of positive squares in 2 ways, for example, as 19688860489 + 11434452624 = 140317^2 + 106932^2 .

It is a cyclic number.

It is not a de Polignac number, because 31123313113 - 2⁹ = 31123312601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31123313153) 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, 40003870 + ... + 40004647.

It is an arithmetic number, because the mean of its divisors is an integer number (7800830505).

Almost surely, 2^31123313113 is an apocalyptic number.

It is an amenable number.

31123313113 is a deficient number, since it is larger than the sum of its proper divisors (80008907).

31123313113 is an equidigital number, since it uses as much as digits as its factorization.

31123313113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80008906.

The product of its digits is 486, while the sum is 22.

Adding to 31123313113 its reverse (31131332113), we get a palindrome (62254645226).

The spelling of 31123313113 in words is "thirty-one billion, one hundred twenty-three million, three hundred thirteen thousand, one hundred thirteen".