3131321 has 2 divisors, whose sum is σ = 3131322. Its totient is φ = 3131320.

The previous prime is 3131311. The next prime is 3131327. The reversal of 3131321 is 1231313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2941225 + 190096 = 1715^2 + 436^2 .

It is an emirp because it is prime and its reverse (1231313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3131321 - 2¹⁰ = 3130297 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3131296 and 3131305.

It is not a weakly prime, because it can be changed into another prime (3131327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1565660 + 1565661.

It is an arithmetic number, because the mean of its divisors is an integer number (1565661).

Almost surely, 2^3131321 is an apocalyptic number.

It is an amenable number.

3131321 is a deficient number, since it is larger than the sum of its proper divisors (1).

3131321 is an equidigital number, since it uses as much as digits as its factorization.

3131321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54, while the sum is 14.

The square root of 3131321 is about 1769.5538985857. The cubic root of 3131321 is about 146.2993950084.

Adding to 3131321 its reverse (1231313), we get a palindrome (4362634).

The spelling of 3131321 in words is "three million, one hundred thirty-one thousand, three hundred twenty-one".