3131021213 has 2 divisors, whose sum is σ = 3131021214. Its totient is φ = 3131021212.

The previous prime is 3131021207. The next prime is 3131021227. The reversal of 3131021213 is 3121201313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3095475769 + 35545444 = 55637^2 + 5962^2 .

It is an emirp because it is prime and its reverse (3121201313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3131021213 - 2⁸ = 3131020957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3131021191 and 3131021200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3131021203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565510606 + 1565510607.

It is an arithmetic number, because the mean of its divisors is an integer number (1565510607).

Almost surely, 2^3131021213 is an apocalyptic number.

It is an amenable number.

3131021213 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131021213 is an equidigital number, since it uses as much as digits as its factorization.

3131021213 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 3131021213 is about 55955.5288867865. The cubic root of 3131021213 is about 1462.9472604634.

Adding to 3131021213 its reverse (3121201313), we get a palindrome (6252222526).

The spelling of 3131021213 in words is "three billion, one hundred thirty-one million, twenty-one thousand, two hundred thirteen".