3121113213 has 6 divisors (see below), whose sum is σ = 4508274654. Its totient is φ = 2080742136.

The previous prime is 3121113209. The next prime is 3121113217. The reversal of 3121113213 is 3123111213.

It is an interprime number because it is at equal distance from previous prime (3121113209) and next prime (3121113217).

It can be written as a sum of positive squares in only one way, i.e., 3044059929 + 77053284 = 55173^2 + 8778^2 .

It is not a de Polignac number, because 3121113213 - 2² = 3121113209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121113217) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 173395170 + ... + 173395187.

It is an arithmetic number, because the mean of its divisors is an integer number (751379109).

Almost surely, 2^3121113213 is an apocalyptic number.

It is an amenable number.

3121113213 is a deficient number, since it is larger than the sum of its proper divisors (1387161441).

3121113213 is a wasteful number, since it uses less digits than its factorization.

3121113213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346790363 (or 346790360 counting only the distinct ones).

The product of its digits is 108, while the sum is 18.

The square root of 3121113213 is about 55866.9241412126. The cubic root of 3121113213 is about 1461.4024824810.

Adding to 3121113213 its reverse (3123111213), we get a palindrome (6244224426).

The spelling of 3121113213 in words is "three billion, one hundred twenty-one million, one hundred thirteen thousand, two hundred thirteen".