3131321213 has 2 divisors, whose sum is σ = 3131321214. Its totient is φ = 3131321212.

The previous prime is 3131321159. The next prime is 3131321233. The reversal of 3131321213 is 3121231313.

It is an a-pointer prime, because the next prime (3131321233) can be obtained adding 3131321213 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2052724249 + 1078596964 = 45307^2 + 32842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3131321213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131321233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565660606 + 1565660607.

It is an arithmetic number, because the mean of its divisors is an integer number (1565660607).

Almost surely, 2^3131321213 is an apocalyptic number.

It is an amenable number.

3131321213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131321213 is an equidigital number, since it uses as much as digits as its factorization.

3131321213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 20.

The square root of 3131321213 is about 55958.2095228216. The cubic root of 3131321213 is about 1462.9939832557.

Adding to 3131321213 its reverse (3121231313), we get a palindrome (6252552526).

The spelling of 3131321213 in words is "three billion, one hundred thirty-one million, three hundred twenty-one thousand, two hundred thirteen".