11031331013 has 4 divisors (see below), whose sum is σ = 11239469388. Its totient is φ = 10823192640.

The previous prime is 11031331009. The next prime is 11031331027. The reversal of 11031331013 is 31013313011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31013313011 = 27457 ⋅1129523.

It can be written as a sum of positive squares in 2 ways, for example, as 9475659649 + 1555671364 = 97343^2 + 39442^2 .

It is a cyclic number.

It is not a de Polignac number, because 11031331013 - 2² = 11031331009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11031330982 and 11031331000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11031331033) 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, 104069108 + ... + 104069213.

It is an arithmetic number, because the mean of its divisors is an integer number (2809867347).

Almost surely, 2^11031331013 is an apocalyptic number.

It is an amenable number.

11031331013 is a deficient number, since it is larger than the sum of its proper divisors (208138375).

11031331013 is an equidigital number, since it uses as much as digits as its factorization.

11031331013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208138374.

The product of its (nonzero) digits is 81, while the sum is 17.

Adding to 11031331013 its reverse (31013313011), we get a palindrome (42044644024).

The spelling of 11031331013 in words is "eleven billion, thirty-one million, three hundred thirty-one thousand, thirteen".