3121113205 has 16 divisors (see below), whose sum is σ = 4281634944. Its totient is φ = 2139566400.

The previous prime is 3121113199. The next prime is 3121113209. The reversal of 3121113205 is 5023111213.

It is not a de Polignac number, because 3121113205 - 2⁵ = 3121113173 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 (3121113209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 130779 + ... + 152791.

It is an arithmetic number, because the mean of its divisors is an integer number (267602184).

Almost surely, 2^3121113205 is an apocalyptic number.

3121113205 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3121113205 is a deficient number, since it is larger than the sum of its proper divisors (1160521739).

3121113205 is a wasteful number, since it uses less digits than its factorization.

3121113205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26076.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 3121113205 is about 55866.9240696139. The cubic root of 3121113205 is about 1461.4024812323.

Adding to 3121113205 its reverse (5023111213), we get a palindrome (8144224418).

The spelling of 3121113205 in words is "three billion, one hundred twenty-one million, one hundred thirteen thousand, two hundred five".