3113821 has 2 divisors, whose sum is σ = 3113822. Its totient is φ = 3113820.

The previous prime is 3113819. The next prime is 3113833. The reversal of 3113821 is 1283113.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 1125721 = 1410^2 + 1061^2 .

It is a cyclic number.

It is not a de Polignac number, because 3113821 - 2¹ = 3113819 is a prime.

Together with 3113819, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3113801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1556910 + 1556911.

It is an arithmetic number, because the mean of its divisors is an integer number (1556911).

Almost surely, 2^3113821 is an apocalyptic number.

It is an amenable number.

3113821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3113821 is an equidigital number, since it uses as much as digits as its factorization.

3113821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144, while the sum is 19.

The square root of 3113821 is about 1764.6022214652. The cubic root of 3113821 is about 146.0263447800.

Adding to 3113821 its reverse (1283113), we get a palindrome (4396934).

The spelling of 3113821 in words is "three million, one hundred thirteen thousand, eight hundred twenty-one".