3113921 has 2 divisors, whose sum is σ = 3113922. Its totient is φ = 3113920.

The previous prime is 3113917. The next prime is 3113923. The reversal of 3113921 is 1293113.

3113921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2190400 + 923521 = 1480^2 + 961^2 .

It is a cyclic number.

It is not a de Polignac number, because 3113921 - 2² = 3113917 is a prime.

Together with 3113923, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 3113893 and 3113902.

It is not a weakly prime, because it can be changed into another prime (3113923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1556960 + 1556961.

It is an arithmetic number, because the mean of its divisors is an integer number (1556961).

Almost surely, 2^3113921 is an apocalyptic number.

It is an amenable number.

3113921 is a deficient number, since it is larger than the sum of its proper divisors (1).

3113921 is an equidigital number, since it uses as much as digits as its factorization.

3113921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 20.

The square root of 3113921 is about 1764.6305562355. The cubic root of 3113921 is about 146.0279079696.

The spelling of 3113921 in words is "three million, one hundred thirteen thousand, nine hundred twenty-one".